Use commit hash to tag container images (#136)

.github/workflows/docker.build.yml

@@ -4,8 +4,6 @@ on:
   push:
     branches:
       - 'main'
-    tags:
-      - '*'
   pull_request:
 
 jobs:
@@ -21,6 +19,8 @@ jobs:
         uses: crazy-max/ghaction-docker-meta@v3.6.0
         with:
           images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=sha
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v1.2.0
@@ -38,7 +38,6 @@ jobs:
       -
         name: Login to GitHub Container Registry
         uses: docker/login-action@v1.10.0
-        if: github.event_name != 'pull_request'
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -52,6 +51,6 @@ jobs:
           platforms: linux/amd64
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
-          push: ${{ github.event_name != 'pull_request' }}
+          push: true
           tags: ${{ steps.docker_meta.outputs.tags }}
           labels: ${{ steps.docker_meta.outputs.labels }}