Create manual_build_arm64.yml

.github/workflows/manual_build_arm64.yml

@@ -0,0 +1,27 @@
+name: manual arm64 image build
+on:
+  workflow_dispatch
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build latest image
+        run: |
+          docker buildx build --push --platform linux/arm64 --tag ghcr.io/${{ github.repository }}/valhalla:manually_triggered_build_arm64 .