feat: Layered devtools image

.github/workflows/build-docker.yml

@@ -145,13 +145,41 @@ jobs:
         run: |
           set -x
           MANIFEST="ghcr.io/ultramarine-linux/ultramarine"
-          RELEASE="39"
+          RELEASE="40"
           ls -lR
           buildah manifest create $MANIFEST
           buildah manifest add $MANIFEST oci-archive:base-base-docker-x86_64-docker/katsu.tar.xz --arch amd64
           buildah manifest add $MANIFEST oci-archive:base-base-docker-aarch64-docker/katsu.tar.xz --arch arm64
           # also tag as latest
           buildah tag $MANIFEST $MANIFEST:latest || :
           buildah manifest push --all --format v2s2 $MANIFEST docker://$MANIFEST:$RELEASE
+    
+  docker-layer:
+    runs-on: ubuntu-latest
+    strategy:
+        fail-fast: true
+        matrix:
+            dockerfile:
+                - dockerfiles/devtools.dockerfile
+
+    steps:
+        - name: Checkout
+          uses: actions/checkout@v2
+        - name: Set up QEMU
+          uses: docker/setup-qemu-action@v3
+
+        - name: Build images
+          uses: docker/build-push-action@v6
+          with:
+              context: .
+              file: ${{ matrix.dockerfile }}
+              platforms: linux/amd64,linux/arm64
+              push: false
+              tags: |
+                  ghcr.io/ultramarine-linux/ultramarine-devtools:40
+                  ghcr.io/ultramarine-linux/ultramarine-devtools:latest
+              args: |
+                  RELEASE=40
+    
 
   #### LIVE ISO ####

dockerfiles/devtools.dockerfile

@@ -0,0 +1,5 @@
+ARG RELEASE
+
+FROM ghcr.io/ultramarine-linux/ultramarine:${RELEASE}
+
+RUN dnf install -y @development-tools