Compute image name inside reusable workflow

Author: Oleg

.github/workflows/build-image.yml

@@ -3,10 +3,6 @@ name: Build test harness image
 on:
   workflow_call:
     inputs:
-      image-name:
-        type: string
-        required: true
-        description: 'Name for the image to build'
       publish-image:
         type: boolean
         default: false
@@ -46,14 +42,20 @@ jobs:
       - name: Install bowtie
         uses: bowtie-json-schema/bowtie@main
 
+      - name: Compute implementation name
+        id: impl
+        env:
+          GH_REPOSITORY: ${{ github.repository }}
+        run: echo "name=$(echo ${GH_REPOSITORY} | awk -F '/' '{print $2}')" >> $GITHUB_OUTPUT
+
       - name: Build
         id: build_image
         uses: redhat-actions/buildah-build@v2
         with:
           context: '.'
           containerfiles: |
             Dockerfile
-          image: ${{ inputs.image-name }}
+          image: ${{ steps.impl.outputs.name }}
           tags: ${{ github.sha }} ${{ inputs.is-latest && 'latest' || '' }}
           archs: amd64, arm64
 

.github/workflows/build.yml

@@ -21,7 +21,6 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       latest-version: ${{ steps.version.outputs.value }}
-      implementation-name: ${{ steps.impl.outputs.name }}
     steps:
 
       - name: Install bowtie
@@ -55,7 +54,6 @@ jobs:
 
     uses: ./.github/workflows/build-image.yml
     with:
-      image-name: ${{ needs.meta.outputs.implementation-name }}
       is-latest: ${{ github.ref == 'refs/heads/main' }}
       publish-image: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
 
@@ -128,6 +126,5 @@ jobs:
 
     uses: ./.github/workflows/build-image.yml
     with:
-      image-name: ${{ needs.meta.outputs.implementation-name }}
       is-latest: ${{ github.event.pull_request.base.ref == 'main' }}
       publish-image: true