Created a GitHub Action to generate the Third Party report.

Signed-off-by: David Venable <dlv@amazon.com>

Author: dlvenable

.github/workflows/third-party-generate.yml

@@ -0,0 +1,35 @@
+# This workflow generates the THIRD-PARTY file and creates a PR from the changes.
+# For more information see: https://github.com/marketplace/actions/create-pull-request
+
+name: Third Party Generate
+
+on:
+  workflow_dispatch:
+
+jobs:
+  generate:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Set up JDK 11
+      uses: actions/setup-java@v1
+      with:
+        java-version: 11
+    - name: Checkout Data-Prepper
+      uses: actions/checkout@v2
+    - name: Generate Third Party Report
+      run: ./gradlew generateThirdPartyReport
+    - name: Create Pull Request
+      uses: peter-evans/create-pull-request@v4.0.4
+      with:
+        add-paths: THIRD-PARTY
+        commit-message: 'Generated THIRD-PARTY file'
+        signoff: true
+        delete-branch: true
+        title: 'Generated THIRD-PARTY file'
+        body: |
+          Generated `THIRD-PARTY` file with:
+
+          ```
+          ./gradlew generateThirdPartyReport
+          ```