remove Docker arm/v7 auto-builds, rename :main to :stable

.github/workflows/docker.yml

@@ -11,7 +11,7 @@ on:
 
 env:
   DOCKER_IMAGE: archivebox-ci
-      
+
 jobs:
   buildx:
     runs-on: ubuntu-latest
@@ -24,21 +24,21 @@ jobs:
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
-      
+
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v3
         with:
           version: latest
           install: true
-          platforms: linux/amd64,linux/arm64,linux/arm/v7
-      
+          platforms: linux/amd64,linux/arm64
+
       - name: Builder instance name
         run: echo ${{ steps.buildx.outputs.name }}
-      
+
       - name: Available platforms
         run: echo ${{ steps.buildx.outputs.platforms }}
-      
+
       - name: Cache Docker layers
         uses: actions/cache@v3
         with:
@@ -51,21 +51,27 @@ jobs:
         uses: docker/login-action@v3
         if: github.event_name != 'pull_request'
         with:
-           username: ${{ secrets.DOCKER_USERNAME }}
-           password: ${{ secrets.DOCKER_PASSWORD }}
-      
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
       - name: Collect Docker tags
+        # https://github.com/docker/metadata-action
         id: docker_meta
         uses: docker/metadata-action@v5
         with:
           images: archivebox/archivebox,nikisweeting/archivebox
           tags: |
+              # :stable
               type=ref,event=branch
+              # :0.7.3
               type=semver,pattern={{version}}
+              # :0.7
               type=semver,pattern={{major}}.{{minor}}
+              # :sha-463ea54
               type=sha
-              type=raw,value=latest,enable={{is_default_branch}}
-      
+              # :latest
+              type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'stable') }}
+
       - name: Build and push
         id: docker_build
         uses: docker/build-push-action@v5
@@ -77,7 +83,7 @@ jobs:
           tags: ${{ steps.docker_meta.outputs.tags }}
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache-new
-          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          platforms: linux/amd64,linux/arm64
 
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}
@@ -88,7 +94,7 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
           repository: archivebox/archivebox
-       
+
       # This ugly bit is necessary if you don't want your cache to grow forever
       # until it hits GitHub's limit of 5GB.
       # Temp fix