Use git shas rather than version tags

ci/docker-publish.yml

@@ -60,7 +60,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Log into registry ${{ env.REGISTRY }}
-        uses: docker/login-action@v1
+        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.repository_owner }}
@@ -68,7 +68,7 @@ jobs:
 
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
@@ -77,7 +77,7 @@ jobs:
               type=semver,pattern={{version}}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
         with:
           context: .
           # Don't push on pull requests