fix: refactor workflow to support multiple images

.github/workflows/build-dx.yml

@@ -0,0 +1,23 @@
+name: Build Bluefin LTS DX
+
+on:
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: "0 1 * * TUE" # Every Tuesday at 1am UTC
+  merge_group:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - "**/README.md"
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/reusable-build-image.yml
+    with:
+      image-name: bluefin
+      image-desc: "Bluefin LTS, built on CentOS Stream with bootc"
+      flavor: dx

.github/workflows/build-hwe.yml

@@ -0,0 +1,23 @@
+name: Build Bluefin LTS HWE
+
+on:
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: "0 1 * * TUE" # Every Tuesday at 1am UTC
+  merge_group:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - "**/README.md"
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/reusable-build-image.yml
+    with:
+      image-name: bluefin
+      image-desc: "Bluefin LTS, built on CentOS Stream with bootc"
+      flavor: hwe

.github/workflows/build-regular.yml

@@ -0,0 +1,22 @@
+name: Build Bluefin LTS
+
+on:
+  pull_request:
+    branches:
+      - main
+  schedule:
+    - cron: "0 1 * * TUE" # Every Tuesday at 1am UTC
+  merge_group:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - "**/README.md"
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/reusable-build-image.yml
+    with:
+      image-name: bluefin
+      image-desc: "Bluefin LTS, built on CentOS Stream with bootc"

.github/workflows/build-image.yml → .github/workflows/reusable-build-image.yml

@@ -1,40 +1,66 @@
 ---
 name: Build Image
 on:
-  pull_request:
-    branches:
-      - main
-  schedule:
-    - cron: "0 1 * * TUE" # Every Tuesday at 1am UTC
-  merge_group:
-  push:
-    branches:
-      - main
-    paths-ignore:
-      - "**/README.md"
-  workflow_dispatch:
+  workflow_call:
+    inputs:
+      image-name:
+        description: "The name of the image to build"
+        required: true
+        type: string
+      image-desc:
+        description: "The description of the image to build"
+        required: true
+        type: string
+      flavor:
+        description: "The flavor of the image to build"
+        required: false
+        type: string
+        default: ""
+      platforms:
+        description: "The platforms to build the image for"
+        required: false
+        type: string
+        default: "amd64,arm64"
 
 env:
-  IMAGE_NAME: "bluefin" # the name of the image produced by this build, matches repo names
-  IMAGE_DESC: "Bluefin LTS, built on CentOS Stream with bootc"
+  IMAGE_NAME: ${{ inputs.image-name }}
+  IMAGE_DESC: ${{ inputs.image-desc }}
   IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"
   DEFAULT_TAG: "lts"
   CENTOS_VERSION: "stream10"
+  PLATFORMS: ${{ inputs.platforms }}
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
   cancel-in-progress: true
 
 jobs:
+  generate_matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - name: Set matrix
+        id: set-matrix
+        run: |
+          # turn the comma separated string into a list
+          platforms=()
+          IFS=',' read -r -a platforms <<< "${{ inputs.platforms }}"
+
+          MATRIX="{\"include\":[]}"
+          for platform in "${platforms[@]}"; do
+            MATRIX=$(echo $MATRIX | jq ".include += [{\"platform\": \"$platform\"}]")
+          done
+          echo "matrix=$(echo $MATRIX | jq -c '.')" >> $GITHUB_OUTPUT
+
   build_push:
     name: Build and push image
     runs-on: ${{ matrix.platform == 'amd64' && 'ubuntu-24.04' || 'ubuntu-24.04-arm' }}
     timeout-minutes: 30
+    needs: generate_matrix
     strategy:
       fail-fast: false
-      matrix:
-        platform: ["amd64", "arm64"]
-        flavor: ["","hwe", "dx", "hwe-dx"]
+      matrix: ${{fromJson(needs.generate_matrix.outputs.matrix)}}
     permissions:
       contents: read
       packages: write
@@ -71,7 +97,7 @@ jobs:
           set -x
           just=$(which just)
           IMAGE_NAME=$IMAGE_NAME
-          FLAVOR=${{ matrix.flavor }}
+          FLAVOR=${{ inputs.flavor }}
           ENABLE_DX=0
           ENABLE_HWE=0
           if [[ "$FLAVOR" =~ "dx" ]] ; then