ci: build native Docker image and push to Gitea Container Registry

Adds:
- Dockerfile based on quarkus-micro-image:2.0 (~50MB base)
  Runs the native binary as non-root user 1001, exposes 8080
- .dockerignore to exclude build artifacts
- Gitea Actions workflow with 3 parallel jobs:
  - build-jvm: standard JAR (mvn package)
  - build-native: GraalVM native binary (mvn package -Pnative)
  - docker-native: takes the native binary artifact, builds
    the container image and pushes to
    gitea.danielarroyo.cl/proyectos/shot-crafter-calculator
    with tags 'latest' and short SHA

Triggers: push to main and PRs (docker job only on push).
Required secrets: GITEA_USERNAME, GITEA_TOKEN (write:packages).

.dockerignore

@@ -0,0 +1,8 @@
+.git
+target
+node_modules
+data
+.mvn
+*.md
+.gitignore
+.gitea

.gitea/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  build-jvm:
+    name: Build JVM
+    runs-on: ubuntu-latest
+    container:
+      image: docker.io/quarkusio/quarkus-images:tooling-21
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Cache Maven
+        uses: actions/cache@v4
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-maven-
+
+      - name: Cache Node + npm
+        uses: actions/cache@v4
+        with:
+          path: |
+            target/node
+            src/frontend/node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('src/frontend/package-lock.json') }}
+          restore-keys: ${{ runner.os }}-node-
+
+      - name: Build (JVM)
+        run: mvn package -B -DskipTests
+
+      - name: Upload JVM artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: shot-crafter-calculator-jvm
+          path: target/quarkus-app/
+
+  build-native:
+    name: Build Native
+    runs-on: ubuntu-latest
+    container:
+      image: docker.io/quarkusio/quarkus-images:tooling-21
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Cache Maven
+        uses: actions/cache@v4
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-maven-
+
+      - name: Cache Node + npm
+        uses: actions/cache@v4
+        with:
+          path: |
+            target/node
+            src/frontend/node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('src/frontend/package-lock.json') }}
+          restore-keys: ${{ runner.os }}-node-
+
+      - name: Build (Native)
+        run: mvn package -Pnative -B -DskipTests
+
+      - name: Upload Native binary
+        uses: actions/upload-artifact@v4
+        with:
+          name: shot-crafter-calculator-runner
+          path: target/shot-crafter-calculator-1.0.0-runner
+
+  docker-native:
+    name: Build & Push Native Image
+    runs-on: ubuntu-latest
+    needs: build-native
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Download native binary
+        uses: actions/download-artifact@v4
+        with:
+          name: shot-crafter-calculator-runner
+          path: target/
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.danielarroyo.cl
+          username: ${{ secrets.GITEA_USERNAME }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Extract short SHA
+        id: meta
+        run: echo "short_sha=${GITHUB_SHA::7}" >> $GITHUB_OUTPUT
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: |
+            gitea.danielarroyo.cl/proyectos/shot-crafter-calculator:latest
+            gitea.danielarroyo.cl/proyectos/shot-crafter-calculator:${{ steps.meta.outputs.short_sha }}
+          platforms: linux/amd64

Dockerfile

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+FROM quay.io/quarkus/quarkus-micro-image:2.0
+WORKDIR /work/
+COPY target/shot-crafter-calculator-1.0.0-runner /work/application
+
+RUN chmod 775 /work /work/application \
+  && chown -R 1001 /work \
+  && echo "securerandom.source=file:/dev/urandom" >> /work/application
+
+EXPOSE 8080
+USER 1001
+
+ENTRYPOINT ["./application", "-Dquarkus.http.host=0.0.0.0"]