Add PR Dependency check workflow

Author: bkhouri

.github/workflows/check_pr_dependency.yml

@@ -0,0 +1,19 @@
+name: Check for Dependencies in PR
+
+on:
+  workflow_call:
+  pull_request_target:
+    types: [opened, edited, reopened, labeled, unlabeled, synchronize]
+
+permissions:
+  issues: read
+  pull-requests: read
+
+jobs:
+  check_dependencies:
+    runs-on: ubuntu-latest
+    name: "Check PR Dependencies"
+    steps:
+      - uses: gregsdennis/dependencies-action@1.4.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/pull_request.yml

@@ -8,6 +8,10 @@ on:
     types: [opened, reopened, synchronize]
 
 jobs:
+  pr_dependency_check:
+    name: PR Dependency Check
+    uses: ./.github/workflows/check_pr_dependency.yml
+
   tests_with_docker_embedded_swift:
     name: Test Embedded Swift SDKs
     uses: ./.github/workflows/swift_package_test.yml

docs/pr-dependency-workflow.md

@@ -0,0 +1,34 @@
+# PR Dependency Workflow Documentation
+
+## Overview
+
+The [`check_pr_dependency.yml`](.github/workflows/check_pr_dependency.yml) workflow uses [a third party GitHub action](https://github.com/marketplace/actions/pr-dependency-check) to enforce PR dependencies.
+
+At the time of writing, the GitHub action supported the following styles, for both issues and PRs.:
+
+- Quick Link: `#5`
+- Partial Link: `gregsdennis/dependencies-action#5`
+- Partial URL: `gregsdennis/dependencies-action/pull/5`
+- Full URL: `https://github.com/gregsdennis/dependencies-action/pull/5`
+- Markdown: `[markdown link](https://github.com/gregsdennis/dependencies-action/pull/5)`
+
+## Usage
+
+Add the following to a `.yaml` file in your `.github/workflows` directory:
+
+```
+name: Check for Dependencies in PR
+
+on:
+  workflow_call:
+  pull_request_target:
+    types: [opened, edited, reopened, labeled, unlabeled, synchronize]
+
+permissions:
+  issues: read
+  pull-requests: read
+
+jobs:
+  check_dependencies:
+     uses: swiftlang/github-workflows/.github/workflows/check_pr_dependency.yml@<to-be-updated>
+```