borrow from ottr-docker

.github/workflows/docker-test.yml

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+# Candace Savonen Apr 2022
+
+name: Build Docker Image
+
+on:
+  workflow_call:
+    inputs:
+      directory:
+        required: true
+        type: string
+      tag:
+        required: true
+        type: string
+      dockerhubpush:
+        description: 'Push to Dockerhub?'
+        required: false
+        default: 'false'
+        type: string
+    secrets:
+      GH_PAT:
+        required: true
+      DOCKERHUB_USERNAME:
+        required: false
+      DOCKERHUB_TOKEN:
+        required: false
+
+defaults:
+  run:
+    working-directory: ./
+
+jobs:
+
+  build-docker:
+    name: Build Docker image
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        if: ${{ inputs.dockerhubpush != 'false' }}
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build
+        uses: docker/build-push-action@v6
+        with:
+          push: ${{ inputs.dockerhubpush }}
+          context: ${{ inputs.directory }}
+          file: ${{ inputs.directory }}/Dockerfile
+          platforms: linux/amd64
+          tags: ${{ inputs.tag }}
+

.github/workflows/manual_dispatch.yml

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+# Candace Savonen May 2022
+
+name: Manual build of docker image
+
+on:
+  workflow_dispatch:
+    inputs:
+      directory:
+        description: 'File path on GitHub to Dockerfile? e.g. inst/extdata'
+        required: true
+        default: inst/extdata
+        type: string
+      tag:
+        description: 'Tag e.g. fhdsl/metricminer:main'
+        required: true
+        type: string
+      dockerhubpush:
+        description: 'Push to Dockerhub? true or false'
+        required: false
+        default: 'false'
+        type: string
+
+jobs:
+
+  build-it:
+    name: Build docker image on command
+    uses: ./.github/workflows/docker-test.yml
+    with:
+      directory: ${{github.event.inputs.directory}}
+      tag: ${{github.event.inputs.tag}}
+      dockerhubpush: ${{github.event.inputs.dockerhubpush}}
+    secrets:
+      GH_PAT: ${{ secrets.GH_PAT }}
+      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+      DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}