Add wp-env for e2e tests

.github/workflows/e2e-tests.yml

@@ -0,0 +1,42 @@
+name: E2E Tests
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+
+jobs:
+  e2e-tests:
+    name: E2E Tests
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Setup Node
+      uses: actions/setup-node@v3
+      with:
+        node-version: 15
+        cache: npm
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build plugin
+      run: npm run build
+
+    - name: Install WordPress
+      run: |
+        chmod -R 767 ./ # TODO: Possibly integrate in wp-env
+        npm run wp-env start
+
+    - name: Run tests
+      run: npm run test:e2e -- --runInBand
+
+    - name: Archive debug artifacts (screenshots, HTML snapshots)
+      uses: actions/upload-artifact@v3
+      if: always()
+      with:
+        name: failures-artifacts
+        path: artifacts

.gitignore

@@ -1,3 +1,4 @@
+artifacts/
 build/
 node_modules/
 vendor/

.wp-env.json

@@ -0,0 +1,6 @@
+{
+	"core": null,
+	"plugins": [
+		"."
+	]
+}