fix: lowercase image name + use QEMU for multi-arch build

GHCR requires lowercase image names. Use a hardcoded lowercase name
instead of github.repository_owner. Switch from matrix runners to
single-job QEMU for arm64 cross-compilation (avoids needing arm runners).

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: GriffinCanCode

.github/workflows/build-binary.yml

@@ -10,29 +10,22 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository_owner }}/callosum-dsl-parser
+  IMAGE_NAME: griffincancode/callosum-dsl-parser
 
 permissions:
   contents: read
   packages: write
 
 jobs:
   build:
-    strategy:
-      matrix:
-        include:
-          - runner: ubuntu-latest
-            platform: linux/amd64
-            tag_suffix: amd64
-          - runner: ubuntu-24.04-arm
-            platform: linux/arm64
-            tag_suffix: arm64
-
-    runs-on: ${{ matrix.runner }}
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -43,33 +36,15 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push
+      - name: Build and push (multi-arch)
         uses: docker/build-push-action@v6
         with:
           context: ./core
           file: ./core/Dockerfile.binary
           push: true
           tags: |
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ matrix.tag_suffix }}
-          platforms: ${{ matrix.platform }}
-          cache-from: type=gha,scope=callosum-${{ matrix.tag_suffix }}
-          cache-to: type=gha,mode=max,scope=callosum-${{ matrix.tag_suffix }}
-
-  manifest:
-    needs: build
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Log in to GHCR
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Create multi-arch manifest
-        run: |
-          docker manifest create ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest \
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:amd64 \
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:arm64
-          docker manifest push ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
+          platforms: linux/amd64,linux/arm64
+          cache-from: type=gha,scope=callosum
+          cache-to: type=gha,mode=max,scope=callosum