Manage environment from a file (#3)

.github/workflows/build.yml

@@ -1,23 +1,24 @@
 name: CI to Docker Hub
 
-on:
+on: [push, pull_request, workflow_dispatch]
-  push:
-    branches: [ master, github-actions ]
-  pull_request:
-    branches: [ master ]
-
-  workflow_dispatch:
 
 jobs:
   multi:
+    env:
+      BUILD_PLATFORMS: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         repository: [restic-auto]
+
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
+      - name: Load specific environment
+        run: if [ -f ${{ matrix.repository }}/.build-env ] ; then cat ${{ matrix.repository }}/.build-env >> $GITHUB_ENV ; fi
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
 
@@ -35,7 +36,7 @@ jobs:
         with:
           context: ${{ matrix.repository }}/
           file: ${{ matrix.repository }}/Dockerfile
-          platforms: linux/amd64,linux/arm/v6,linux/arm64
+          platforms: ${{ env.BUILD_PLATFORMS }}
           push: true
           tags: |
             ${{ secrets.DOCKER_HUB_USERNAME }}/${{ matrix.repository }}:latest

restic-auto/.build-env

@@ -0,0 +1 @@
+BUILD_PLATFORMS=linux/amd64,linux/arm/v6,linux/arm64