Refactor Dockerfile to use multi-stage builds for Metricbeat and remove outdated FROM version update step

.gitea/workflows/build.yaml

@@ -27,9 +27,6 @@ jobs:
           username: ${{ vars.PHOENIX_PACKAGE_WRITER_USERNAME }}
           password: ${{ secrets.PHOENIX_PACKAGE_WRITER_TOKEN }}
 
-      - name: Update Dockerfile FROM version
-        run: sed -i "s|^FROM .\+|FROM docker.elastic.co/beats/metricbeat-oss:${{ env.VERSION }}|" Dockerfile
-
       - name: Build and push to gitea registry
         uses: docker/build-push-action@v6
         with:

Dockerfile

@@ -1,3 +1,33 @@
-FROM docker.elastic.co/beats/metricbeat-oss:latest
+# Step 1: Prepare the build environment
+FROM golang:1.16 AS builder
 
+# Define the Metricbeat version as a build argument
+ARG VERSION
+
+# Install Git to clone the repository
+RUN apt-get update && apt-get install -y git && apt-get clean
+
+# Clone the Elastic Beats repository and switch to the specified version
+WORKDIR /go/src/github.com/elastic/beats
+RUN git clone https://github.com/elastic/beats.git . && git checkout v${VERSION}
+
+# Compile Metricbeat for the s390x architecture
+RUN GOARCH=s390x go build -o metricbeat ./metricbeat
+
+# Step 2: Build the final image
+FROM debian:buster-slim
+
+# Set the working directory
+WORKDIR /usr/share/metricbeat
+
+# Copy the Metricbeat binary from the build stage
+COPY --from=builder /go/src/github.com/elastic/beats/metricbeat .
+
+# Add a default metricbeat.yml configuration file (customize as needed)
 COPY metricbeat.yml /usr/share/metricbeat/metricbeat.yml
+
+# Grant necessary permissions to execute Metricbeat
+RUN chmod +x /usr/share/metricbeat/metricbeat
+
+# Define the container's entry point
+ENTRYPOINT ["/usr/share/metricbeat/metricbeat"]