Faster OCI builds

* use the official erlang image as the base
  (no more openssl and erlang recompilation)
* build with OTP26 and OTP27 (compilation is performed with the same
  OTP version that is used at runtime)
* remove a bunch of things that are not clearly needed

.github/workflows/oci-make.yaml

@@ -2,6 +2,8 @@
 name: OCI (make)
 on:
   push:
+    branches:
+      - fast-oci
     paths-ignore:
       - '.github/workflows/secondary-umbrella.yaml'
       - '.github/workflows/update-elixir-patches.yaml'
@@ -10,12 +12,15 @@ on:
       - '*.md'
   workflow_dispatch:
 env:
-  REGISTRY_IMAGE: pivotalrabbitmq/rabbitmq
+  REGISTRY_IMAGE: pivotalrabbitmq/rabbitmq-test
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 jobs:
   build-package-generic-unix:
+    strategy:
+      matrix:
+        otp_version: [26, 27]
     runs-on: ubuntu-latest
     outputs:
       authorized: ${{ steps.authorized.outputs.authorized }}
@@ -35,43 +40,34 @@ jobs:
         if: steps.authorized.outputs.authorized == 'true'
         uses: erlef/setup-beam@v1
         with:
-          otp-version: 26.2
-          elixir-version: 1.15
+          otp-version: ${{ matrix.otp_version }}
+          elixir-version: latest
       - name: make package-generic-unix
         if: steps.authorized.outputs.authorized == 'true'
         run: |
           make package-generic-unix PROJECT_VERSION=4.1.0-alpha.1
       - name: Upload package-generic-unix
         if: steps.authorized.outputs.authorized == 'true'
-        uses: actions/upload-artifact@v4.3.1
+        uses: actions/upload-artifact@v4
         with:
-          name: package-generic-unix
+          name: package-generic-unix-otp${{ matrix.otp_version }}
           path: PACKAGES/rabbitmq-server-*.tar.xz
 
-  build:
-    needs: build-package-generic-unix
-    runs-on: ubuntu-latest
-    if: ${{ needs.build-package-generic-unix.outputs.authorized }} == 'true'
+  build-and-push:
     strategy:
       fail-fast: false
       matrix:
-        platform:
-          - linux/amd64
-          # Unfortunately even with type=gha cache, OpenSSL and OTP
-          # are rebuilt often and it takes ~90 minutes to do that
-          # in the emulated ARM mode. Disabling until we have a better solution.
-          #- linux/arm64
+        otp_version: [26, 27]
+    needs: build-package-generic-unix
+    runs-on: ubuntu-latest
+    if: ${{ needs.build-package-generic-unix.outputs.authorized }} == 'true'
     steps:
-      - name: Prepare
-        run: |
-          platform=${{ matrix.platform }}
-          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
       - name: Checkout
         uses: actions/checkout@v4
       - name: Download package-generic-unix
         uses: actions/download-artifact@v4
         with:
-          name: package-generic-unix
+          name: package-generic-unix-otp${{ matrix.otp_version }}
           path: PACKAGES
       - name: Rename package-generic-unix
         run: |
@@ -83,6 +79,8 @@ jobs:
         uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY_IMAGE }}
+          flavor: |
+            suffix=-otp${{ matrix.otp_version }}
           tags: |
             type=ref,event=branch
             type=ref,event=pr
@@ -91,12 +89,6 @@ jobs:
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
@@ -106,71 +98,51 @@ jobs:
         id: build
         uses: docker/build-push-action@v6
         with:
+          push: true
           context: packaging/docker-image
-          platforms: ${{ matrix.platform }}
-          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64, linux/arm64
+          #labels: ${{ steps.meta.outputs.labels }}
+          tags: ${{ steps.meta.outputs.tags }}
+          #tags: pivotalrabbitmq/rabbitmq-test:otp${{ matrix.otp_version }}
           cache-to: type=gha
           cache-from: type=gha
-          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
-      - name: Export digest
-        run: |
-          mkdir -p /tmp/digests
-          digest="${{ steps.build.outputs.digest }}"
-          touch "/tmp/digests/${digest#sha256:}"
-      - name: Upload digest
-        uses: actions/upload-artifact@v4
-        with:
-          name: digests-${{ env.PLATFORM_PAIR }}
-          path: /tmp/digests/*
-          if-no-files-found: error
-          retention-days: 1
+          #outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+          build-args:
+            OTP_VERSION=${{ matrix.otp_version }}
 
-  merge:
-    needs:
-      - build
-    runs-on: ubuntu-latest
-    if: ${{ needs.build-package-generic-unix.outputs.authorized }} == 'true'
-    steps:
-      - name: Download digests
-        uses: actions/download-artifact@v4
-        with:
-          path: /tmp/digests
-          pattern: digests-*
-          merge-multiple: true
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY_IMAGE }}
-          tags: |
-            type=ref,event=branch
-            type=ref,event=pr
-            type=sha,format=long
-      - name: Login to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_PASSWORD }}
-      - name: Create manifest list and push
-        working-directory: /tmp/digests
-        run: |
-          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
-            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
-      - name: Inspect image
-        run: |
-          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}
-
-  summary-oci:
-    needs:
-    - build-package-generic-unix
-    - build
-    - merge
-    runs-on: ubuntu-latest
-    steps:
-    - name: SUMMARY
-      run: |
-        cat << 'EOF' | jq -e 'map(.result == "success") | all(.)'
-        ${{ toJson(needs) }}
-        EOF
+  # merge:
+  #   needs:
+  #     - build
+  #   runs-on: ubuntu-latest
+  #   if: ${{ needs.build-package-generic-unix.outputs.authorized }} == 'true'
+  #   steps:
+  #     - name: Download digests
+  #       uses: actions/download-artifact@v4
+  #       with:
+  #         path: /tmp/digests
+  #         pattern: digests-*
+  #         merge-multiple: true
+  #     - name: Set up Docker Buildx
+  #       uses: docker/setup-buildx-action@v3
+  #     - name: Docker meta
+  #       id: meta
+  #       uses: docker/metadata-action@v5
+  #       with:
+  #         images: ${{ env.REGISTRY_IMAGE }}
+  #         tags: |
+  #           type=ref,event=branch
+  #           type=ref,event=pr
+  #           type=sha,format=long
+  #     - name: Login to Docker Hub
+  #       uses: docker/login-action@v3
+  #       with:
+  #         username: ${{ secrets.DOCKERHUB_USERNAME }}
+  #         password: ${{ secrets.DOCKERHUB_PASSWORD }}
+  #     - name: Create manifest list and push
+  #       working-directory: /tmp/digests
+  #       run: |
+  #         docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+  #           $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)
+  #     - name: Inspect image
+  #       run: |
+  #         docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}