tag with only suffix if exists and ref is a tag

Author: jordan-evens

.github/workflows/build-docker-image.yml

@@ -126,12 +126,13 @@ jobs:
           flavor: |
             latest=${{ case ( '' == inputs.suffix, 'auto', '' ) }}
             prefix=
-            suffix=${{ inputs.suffix }}
+            suffix=${{ case ( '' == inputs.suffix, '', '-'inputs.suffix ) }}
           tags: |
             type=ref,event=branch
             type=ref,event=pr
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=${{ inputs.suffix }},prefix=,suffix=,enable=${{ startsWith(github.ref, 'refs/tags/v') && '' != inputs.suffix }}
 
       - name: Create manifest list and push
         working-directory: ${{ runner.temp }}/digests

.github/workflows/build-docker.yml

@@ -20,7 +20,7 @@ jobs:
     with:
       image: firestarr-minimal
       cache-from: "type=registry,ref=ghcr.io/cwfmf/firestarr-cpp/cache:"
-      suffix: "-minimal"
+      suffix: "minimal"
 
   cleanup-docker:
     needs: [build-docker-minimal]