Initial version of the wrapper

Introduce Slack Notification Resource wrapper to build resource image.

.github/dependabot.yml

@@ -0,0 +1,13 @@
+---
+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: weekly
+- package-ecosystem: gitsubmodule
+  directory: /
+  allow:
+  - dependency-name: src/slack-notification-resource
+  schedule:
+    interval: weekly

.github/workflows/auto-merge.yml

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+---
+name: Dependabot auto-merge
+
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+    - name: Dependabot metadata
+      id: metadata
+      uses: dependabot/[email protected]
+      with:
+        github-token: "${{ secrets.GITHUB_TOKEN }}"
+
+    - name: Enable auto-merge for Dependabot PRs
+      env:
+        PR_URL: ${{github.event.pull_request.html_url}}
+        GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      run: |
+        gh pr review --approve "$PR_URL"
+        gh pr merge --auto --merge "$PR_URL"

.github/workflows/release.yml

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+---
+name: Release Slack Notification Resource
+
+on:
+  push:
+    branches:
+    - main
+
+jobs:
+  image:
+    if: ${{ github.repository == 'homeport/slack-notification-resource' }}
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+
+    env:
+      IMAGE_HOST: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build and push container image
+      env:
+        REGISTRY_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
+        REGISTRY_USERNAME: ${{ github.repository_owner }}
+        DOCKER_BUILDKIT: "1"
+        BUILDKIT_PROGRESS: plain
+      run: |
+        docker login \
+          --username "$REGISTRY_USERNAME" \
+          --password-stdin \
+          "$IMAGE_HOST" <<<"$REGISTRY_PASSWORD"
+
+        docker build \
+          --push \
+          --tag "${IMAGE_HOST}/${IMAGE_NAME}:latest" \
+          --file src/slack-notification-resource/Dockerfile
+          src/slack-notification-resource

.gitmodules

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+[submodule "src/slack-notification-resource"]
+	path = src/slack-notification-resource
+	url = https://github.com/cloudfoundry-community/slack-notification-resource.git

README.md

@@ -1,2 +1,3 @@
-# slack-notification-resource
-Wrapper for https://github.com/cloudfoundry-community/slack-notification-resource
+# Slack Notification Resource
+
+Wrapper for [cloudfoundry-community/slack-notification-resource](https://github.com/cloudfoundry-community/slack-notification-resource).