release: build multi-arch docker image

.github/workflows/build.yml

@@ -267,9 +267,24 @@ jobs:
     name: Publish pre-release
     needs: [build]
     runs-on: ubuntu-24.04
+    permissions:
+      packages: write
+      attestations: write
     steps:
+      - name: Check out
+        uses: actions/checkout@v4
+      - name: Setup buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Download artifacts
         uses: actions/download-artifact@v4
+      - name: Display structure of downloaded files
+        run: ls -R
       - name: Create assets
         run: |
           tar czf otel-profiling-agent-${RELEASE_VERSION}-aarch64.tar.gz -C agent-aarch64 .
@@ -305,3 +320,6 @@ jobs:
           prerelease: true
           draft: false
           tag: ${{ env.RELEASE_VERSION }}
+      - name: Build and push container image
+        run: |
+          docker buildx build --push -f Dockerfile.release --platform linux/amd64,linux/arm64 -t ghcr.io/datadog/otel-profiling-agent:${{ env.RELEASE_VERSION }} .

Dockerfile.release

@@ -0,0 +1,18 @@
+# syntax=docker.io/docker/dockerfile:1.7-labs
+FROM ubuntu:24.04
+
+USER root
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends binutils curl sudo ca-certificates
+
+COPY --parents agent-** /tmp/
+
+RUN mv /tmp/agent-$(uname -p)/otel-profiling-agent /usr/local/bin/otel-profiling-agent \
+    && chmod +x /usr/local/bin/otel-profiling-agent \
+    && rm -rf /tmp/agent*
+
+RUN apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+CMD ["/bin/sh", "-c", "sudo -E /usr/local/bin/otel-profiling-agent"]