Adds docker and woodpecker files

Dockerfile

@@ -0,0 +1,14 @@
+FROM amazoncorretto:21-alpine-jdk AS build
+WORKDIR /app
+COPY gradlew .
+COPY gradle/ gradle/
+COPY build.gradle.kts settings.gradle.kts ./
+RUN ./gradlew dependencies --no-daemon
+COPY src/ src/
+RUN ./gradlew bootJar --no-daemon
+
+FROM amazoncorretto:21-alpine-jdk
+WORKDIR /app
+COPY --from=build /app/build/libs/*.jar app.jar
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "app.jar"]