Extract common steps to separate action

.github/actions/setup-and-validate/action.yml

@@ -0,0 +1,23 @@
+name: "Theme Validation"
+description: "Validate the themes"
+runs:
+  using: "composite"
+  steps:
+    - name: Set up Node.js
+      uses: actions/setup-node@v1.2.0
+      with:
+        node-version: '16'
+      env:
+        ACTIONS_ALLOW_UNSECURE_COMMANDS: 'true'
+
+    - name: install deps
+      run: npm ci
+      shell: bash
+
+    - name: create generated dir
+      run: mkdir ./assets/generated
+      shell: bash
+
+    - name: Prepare deploy
+      run: npm run prepare-deploy
+      shell: bash