ci: supporting installation using a remote repo instead of bundles

.github/workflows/release-repo.yml

@@ -0,0 +1,63 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch: # can be manually dispatched under GitHub's "Actions" tab 
+
+concurrency:
+  group: '${{ github.workflow }} @ ${{ github.ref }}'
+  cancel-in-progress: false
+
+jobs:
+  release:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Checkout Flatpak repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: flatpak-repository
+          path: repo
+      - name: Setup GPG
+        id: import-gpg
+        uses: crazy-max/ghaction-import-gpg@v6
+        with:
+          gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
+          git_config_global: true
+          git_user_signingkey: true
+          git_commit_gpgsign: true
+      - name: Install dependencies
+        run: |
+          DEBIAN_FRONTEND=noninteractive sudo apt-get update -y
+          git config --global protocol.file.allow always
+          sudo apt-get install --no-install-recommends -y \
+            icoutils \
+            flatpak \
+            flatpak-builder \
+            elfutils
+          flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+      - name: Cache Flatpak builder
+        id: cache-flatpak-builder
+        uses: actions/cache@v4
+        with:
+          path: .flatpak-builder
+          key: ${{ runner.os }}-flatpak-builder-${{ github.workflow }}
+      - name: Build Flatpak
+        run: |
+          ./build.sh sign
+      - name: Push Flatpak repository
+        run: |
+          cd repo
+          git add -A
+          git commit --signoff -m "Update com.jagexlauncher.JagexLauncher"
+          git reset $(git commit-tree HEAD^{tree} -m "Update com.jagexlauncher.JagexLauncher")
+          git push --progress -f origin flatpak-repository
+        env:
+          GIT_AUTHOR_NAME: ${{ steps.import-gpg.outputs.name }}
+          GIT_AUTHOR_EMAIL: ${{ steps.import-gpg.outputs.email }}
+          GIT_COMMITTER_NAME: ${{ steps.import-gpg.outputs.name }}
+          GIT_COMMITTER_EMAIL: ${{ steps.import-gpg.outputs.email }}

build.sh

@@ -4,4 +4,4 @@ cd icons
 cd ..
 
 flatpak remote-add --if-not-exists --user flathub https://flathub.org/repo/flathub.flatpakrepo
-flatpak-builder --install-deps-from=flathub --user --install --force-clean build-dir --disable-cache "$(basename $(git rev-parse --show-toplevel)).yml"
+flatpak-builder --repo ./repo --gpg-sign=787C55D80BC4CB5BB385FC67B9D5939A8F40EB05 --user --install --force-clean build-dir --disable-cache "$(basename $(git rev-parse --show-toplevel)).yml"