Add deploy to heroku

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/deploy_heroku.yml

@@ -0,0 +1,39 @@
+on:
+  push:
+jobs:
+  deploy:
+    concurrency: http4k-irc
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/[email protected]
+      - name: Setup Java
+        uses: actions/[email protected]
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: gradle
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+      - name: Cache Gradle packages
+        uses: actions/[email protected]
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Deploy to Heroku
+        uses: AkhileshNS/[email protected]
+        with:
+          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
+          heroku_app_name: http4k-irc
+          heroku_email: ${{secrets.HEROKU_EMAIL}}
+      - name: Cleanup Gradle Cache
+          # Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
+          # Restoring these files from a GitHub Actions cache might cause problems for future builds.
+        run: |
+          rm -f ~/.gradle/caches/modules-2/modules-2.lock
+          rm -f ~/.gradle/caches/modules-2/gc.properties
+