chore(forgejo): try something new with the build workflow

.forgejo/workflows/build-images.yaml

@@ -5,25 +5,38 @@ on:
     paths:
     - 'apps/*/Dockerfile'
   workflow_dispatch:
-
+    inputs:
+      dockerfile:
+        description: "Optional Dockerfile path to build. Example: 'apps/ci-os/Dockerfile'"
+        required: false
+      image:
+        description: "Optional container image name. Example: 'my-org/my-image:latest'"
+        required: false
 
 jobs:
-  # 1) Find all Dockerfiles under apps/* and output them as JSON
+  # 1) Find all Dockerfiles under apps/* OR use the user-specified Dockerfile
   discover-dockerfiles:
     runs-on: ci-os
     outputs:
-      dockerfiles: ${{ steps.set-matrix.outputs.dockerfiles }}
+      dockerfiles: ${{ steps.set-dockerfiles.outputs.dockerfiles }}
     steps:
     - name: Checkout
       uses: actions/checkout@v4
 
-    - id: set-matrix
-      name: Find Dockerfiles
+    - id: set-dockerfiles
+      name: Resolve Dockerfiles
       run: |
-        # Find all Dockerfiles in apps/* subdirectories
+        # If 'dockerfile' was provided via workflow_dispatch, use it directly:
+        if [ -n "${{ github.event.inputs.dockerfile }}" ]; then
+          echo "Single Dockerfile specified: ${{ github.event.inputs.dockerfile }}"
+          echo "dockerfiles=[\"${{ github.event.inputs.dockerfile }}\"]" >> "$GITHUB_OUTPUT"
+          exit 0
+        fi
+
+        # Otherwise, discover all Dockerfiles in apps/*:
         files=$(find apps -mindepth 2 -maxdepth 2 -type f -name Dockerfile)
 
-        # If no Dockerfiles found, output an empty array to avoid parsing errors
+        # If no Dockerfiles found, output an empty array
         if [ -z "$files" ]; then
           echo 'dockerfiles=[]' >> "$GITHUB_OUTPUT"
           exit 0
@@ -34,10 +47,8 @@ jobs:
         for f in $files; do
           json="${json}\"$f\","
         done
-        # Remove trailing comma and close array
         json="${json%,}]"
 
-        # Write to job output
         echo "dockerfiles=$json" >> "$GITHUB_OUTPUT"
 
   # 2) For each Dockerfile discovered, build & push with Kaniko
@@ -50,21 +61,28 @@ jobs:
         dockerfile: ${{ fromJSON(needs.discover-dockerfiles.outputs.dockerfiles) }}
 
     steps:
-    - name: Checkout Repository
+    - name: Checkout
       uses: actions/checkout@v4
 
+    - id: set-image
+      name: Determine Image Name
+      run: |
+        # If the user provided a container image name, use it
+        if [ -n "${{ github.event.inputs.image }}" ]; then
+          echo "image=${{ github.event.inputs.image }}" >> "$GITHUB_OUTPUT"
+        else
+          # Otherwise parse from the Dockerfile path
+          # e.g. "apps/ci-os/Dockerfile" => "ci-os"
+          image=$(echo "${{ matrix.dockerfile }}" | sed 's|apps/||g' | sed 's|/Dockerfile||g')
+          echo "image=$image" >> "$GITHUB_OUTPUT"
+        fi
+
     - name: Build and Push with Kaniko
       uses: https://code.252.no/pub/kaniko-action@latest
       with:
         context: ./
         dockerfile: ${{ matrix.dockerfile }}
-        destinations: >
-          code.252.no/${{ github.repository }}/${ { matrix.dockerfile
-            // remove `apps/`
-            // remove `/Dockerfile`
-            // e.g. "apps/ci-os/Dockerfile" => "ci-os"
-            // There's no built-in function to do this inline, so consider a real approach:
-          }}:latest
+        destinations: "code.252.no/${{ github.repository }}/${{ steps.set-image.outputs.image }}:latest"
         credentials: "code.252.no=tommy:${{ secrets.REGISTRY_TOKEN }}"
         push: "true"
         cache: "false"