feat: add CI build and Dockerfile

.dockerignore

@@ -0,0 +1,3 @@
+target
+node_modules
+infra

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches:
+      - main
+      - feat/cdk # remove before merging
+
+jobs:
+  build:
+    name: Build
+
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    env:
+      tag: todo
+
+    steps:
+    - uses: actions/checkout@v4
+    - run: |
+        tag=ghcr.io/opetushallitus/koto-rekisteri:$GITHUB_SHA
+        docker build -t $tag . 
+        docker push $tag
+    - run: |
+        npm ci
+        npx cdk deploy --all
+      working-directory: infra

Dockerfile

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+FROM maven:3.9.9-amazoncorretto-21
+
+WORKDIR /kitu
+
+COPY . .
+
+RUN mvn package -DskipTests
+
+ENTRYPOINT ["java", "-jar", "target/kitu-0.0.1-SNAPSHOT.jar"]