Fix manual variant selection using setup job matrix output

.github/workflows/container_latest.yml

@@ -28,16 +28,28 @@ permissions:
   contents: read
 
 jobs:
+  setup:
+    runs-on: ubuntu-latest
+    outputs:
+      variants: ${{ steps.set-variants.outputs.variants }}
+    steps:
+      - name: Select variants for this run
+        id: set-variants
+        run: |
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ] && [ "${{ github.event.inputs.variant }}" != "all" ]; then
+            variants="[\"${{ github.event.inputs.variant }}\"]"
+          else
+            variants='["standard","large_disk"]'
+          fi
+          echo "variants=$variants" >> "$GITHUB_OUTPUT"
+
   build:
+    needs: [setup]
     runs-on: ubuntu-latest
-    if: |
-      github.event_name != 'workflow_dispatch' ||
-      github.event.inputs.variant == 'all' ||
-      github.event.inputs.variant == matrix.variant
     strategy:
       matrix:
         platform: [amd64, arm64, arm, 386]
-        variant: [standard, large_disk]
+        variant: ${{ fromJSON(needs.setup.outputs.variants) }}
 
     steps:
       - name: Checkout
@@ -139,17 +151,11 @@ jobs:
 
   create-manifest:
     runs-on: ubuntu-latest
-    needs: [build]
-    if: |
-      github.event_name != 'pull_request' &&
-      (
-        github.event_name != 'workflow_dispatch' ||
-        github.event.inputs.variant == 'all' ||
-        github.event.inputs.variant == matrix.variant
-      )
+    needs: [setup, build]
+    if: github.event_name != 'pull_request'
     strategy:
       matrix:
-        variant: [standard, large_disk]
+        variant: ${{ fromJSON(needs.setup.outputs.variants) }}
     steps:
       - name: Checkout
         uses: actions/checkout@v6