adding github workflows

.github/workflows/pull_request.yaml

@@ -0,0 +1,30 @@
+name: Pull Request
+
+on:
+  pull_request:
+
+jobs:
+  changes:
+    uses: ./.github/workflows/changes.yaml
+
+  build-api:
+    if: ${{ needs.changes.outputs.api == 'true' }}
+    name: build-api
+    needs:
+      - changes
+    uses: ./.github/workflows/api_build.yaml
+    with:
+      environment_name: pull_request
+      version_number: ${{ github.run_id }}
+    secrets: inherit
+
+  build-app:
+    if: ${{ needs.changes.outputs.app == 'true' }}
+    name: build-app
+    needs:
+      - changes
+    uses: ./.github/workflows/app_build.yaml
+    with:
+      environment_name: pull_request
+      version_number: ${{ github.run_id }}
+    secrets: inherit