Build derivative images after base images

This will let e.g. arch, ubuntu, or whatever other 'base' custom images
build in parallel while letting the derivative images reuse the newly built
image afterwards.

Signed-off-by: Robert Detjens <[email protected]>

.github/workflows/build.yml

@@ -16,14 +16,43 @@ env:
   IMAGE: ${{ github.repository_owner }}/toolbx-images
 
 jobs:
-  build:
+  base-images:
     runs-on: ubuntu-24.04
     strategy:
-      max-parallel: 1 # dont run these concurrently so zed picks up the new arch image
       matrix:
         tag:
           - arch
           - ubuntu
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Build Image
+        id: build_image
+        uses: redhat-actions/buildah-build@main
+        with:
+          image: ${{ env.IMAGE }}
+          tags: ${{ matrix.tag }}
+          context: ${{ matrix.tag }}
+          containerfiles: ./${{ matrix.tag }}/Containerfile
+
+      - name: Push To GHCR
+        uses: redhat-actions/push-to-registry@main
+        id: push-ghcr
+        with:
+          registry: ghcr.io
+          image: ${{ steps.build_image.outputs.image }}
+          tags: ${{ steps.build_image.outputs.tags }}
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+  deriv-images:
+    runs-on: ubuntu-24.04
+    needs: base-images
+    strategy:
+      matrix:
+        tag:
           - zed
 
     steps: