Add a stub for the herald Docker image

.github/workflows/deploy.yml

@@ -44,3 +44,42 @@ jobs:
       - id: URL
         run: echo "::set-output name=URL::$(jq -r '.JProfByBotStack.URL' cdk.out/outputs.json)"
         working-directory: .deploy/lambda
+
+  herald:
+    name: Herald
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-java@v2
+        with:
+          distribution: adopt
+          java-version: 17
+
+      - uses: gradle/wrapper-validation-action@v1
+
+      - uses: gradle/gradle-build-action@v2
+        with:
+          arguments: :herald:install
+          cache-read-only: ${{ github.ref != 'refs/heads/master' }}
+
+      - uses: docker/metadata-action@v3
+        id: metadata
+        with:
+          images: |
+            ghcr.io/${{ github.repository_owner }}/herald
+          flavor: |
+            latest=true
+
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: docker/build-push-action@v2
+        with:
+          context: herald
+          push: true
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}

herald/Dockerfile

@@ -0,0 +1,7 @@
+ARG JAVA=17
+
+FROM openjdk:${JAVA}
+
+COPY build/install/* /opt/herald
+
+ENTRYPOINT ["/opt/herald/bin/herald"]

herald/README.adoc

@@ -0,0 +1,3 @@
+= Herald
+
+This feature posts scheduled messages to the chat.

herald/build.gradle.kts

@@ -0,0 +1,8 @@
+plugins {
+    kotlin("jvm")
+    application
+}
+
+application {
+    mainClass.set("by.jprof.telegram.bot.herald.AppKt")
+}

herald/src/main/kotlin/by/jprof/telegram/bot/herald/App.kt

@@ -0,0 +1,5 @@
+package by.jprof.telegram.bot.herald
+
+suspend fun main(args: Array<String>) {
+    println("Hello, world!")
+}

settings.gradle.kts

@@ -30,3 +30,4 @@ include(":pins:dynamodb")
 include(":pins:sfn")
 include(":runners:lambda")
 include(":currencies")
+include(":herald")