ci: add commit hash tag to image tags

Author: sdellaco

.github/workflows/build.yaml

@@ -22,6 +22,12 @@ jobs:
         with:
           images: |
             name=ghcr.io/${{ github.repository }}
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=sha,prefix=sha-,suffix=,format=short
       - name: Login to ghcr.io
         uses: docker/login-action@v1
         with: