build: reducing docker image size (#36)

Author: Frnd-me

.github/workflows/docker.yml

@@ -46,7 +46,7 @@ jobs:
         uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671
         with:
           context: .
-          file: ./Dockerfile.build
+          file: ./Dockerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,20 @@
+FROM gradle:8.7.0-jdk21-alpine AS build
+
+ARG GRADLE_OPTS
+
+RUN apk add --no-cache protoc unzip
+
+COPY --chown=gradle:gradle . /usr/src/cirrina
+WORKDIR /usr/src/cirrina
+
+RUN gradle distZip
+
+# Unpack distribution and normalize path
+RUN unzip build/distributions/cirrina.zip -d /tmp \
+    && chmod +x /tmp/cirrina/bin/cirrina
+
+FROM gcr.io/distroless/java21-debian12 AS runtime
+
+COPY --from=build /tmp/cirrina /opt/cirrina
+
+ENTRYPOINT ["java", "-cp", "/opt/cirrina/lib/*", "at.ac.uibk.dps.cirrina.cirrina.Cirrina"]