🚧 github: Work around that actions can't have list inputs

.github/workflows/build-subimage.yml

@@ -6,7 +6,7 @@ on:
         type: string
       tags:
         required: true
-        type: List
+        type: String
     secrets:
       DOCKERHUB_USERNAME:
         required: true
@@ -40,4 +40,5 @@ jobs:
           file: Dockerfile-${{ inputs.subimage }}
           build-args:
             DRONE_COMMIT=${{ github.sha }}
+          tags: ${{ inputs.tags }}
           push: true

.github/workflows/build.yml

@@ -18,8 +18,7 @@ jobs:
     uses: ./.github/workflows/build-subimage.yml
     with:
       subimage: ${{ matrix.subimage }}
-      tags:
-        - quratorspk/ocrd-galley-${{ inputs.subimage }}:${{ github.sha }}
+      tags: quratorspk/ocrd-galley-${{ inputs.subimage }}:${{ github.sha }}
     secrets: inherit
 
   build-rest:
@@ -30,8 +29,7 @@ jobs:
     uses: ./.github/workflows/build-subimage.yml
     with:
       subimage: ${{ matrix.subimage }}
-      tags:
-        - quratorspk/ocrd-galley-${{ inputs.subimage }}:${{ github.sha }}
+      tags: quratorspk/ocrd-galley-${{ inputs.subimage }}:${{ github.sha }}
     secrets: inherit