Add script to build Docker image from forked code

README-fork.md

@@ -4,3 +4,17 @@ This is my personal fork of `Athou/commafeed` with some tweaks:
 
 - "Infrequent" tab - like "All" but limits to blogs w/ an average post interval greater than a user-configurable number of days
 - User preference to disable the swipe-to-open-menu gesture on mobile
+
+## Building
+
+Use `gmfork-build-docker.sh` to build the JVM Docker image for `linux/amd64`:
+
+```sh
+DOCKER_REGISTRY=myregistry.example.com ./gmfork-build-docker.sh
+```
+
+To run locally:
+
+```sh
+docker run -p 8082:8082 $DOCKER_REGISTRY/commafeed-fork:latest
+```

gmfork-build-docker.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "$0")" && pwd)"
+ARTIFACTS_DIR="$REPO_ROOT/artifacts"
+
+if [ -z "${DOCKER_REGISTRY:-}" ]; then
+    echo "Error: DOCKER_REGISTRY is not set" >&2
+    exit 1
+fi
+
+# Build
+cd "$REPO_ROOT"
+./mvnw --batch-mode --no-transfer-progress install -Ph2 -DskipTests
+
+# Prepare artifacts
+rm -rf "$ARTIFACTS_DIR"
+mkdir -p "$ARTIFACTS_DIR"
+
+cp commafeed-server/target/commafeed-*-jvm.zip "$ARTIFACTS_DIR/"
+unzip -q "$ARTIFACTS_DIR"/*-jvm.zip -d "$ARTIFACTS_DIR/extracted-jvm-package"
+mv "$ARTIFACTS_DIR/extracted-jvm-package"/commafeed-* "$ARTIFACTS_DIR/extracted-jvm-package/quarkus-app"
+
+# Build image
+docker build \
+    --platform linux/amd64 \
+    --file commafeed-server/src/main/docker/Dockerfile.jvm \
+    --tag "$DOCKER_REGISTRY/commafeed-fork:latest" \
+    .
+
+rm -rf "$ARTIFACTS_DIR"
+
+echo "Built: $DOCKER_REGISTRY/commafeed-fork:latest"