Add capability to build docs to a dev folder (#1351)

To enable the web upload from dev versions

.github/workflows/manual_docs_to_dev.yml

@@ -0,0 +1,46 @@
+name: Build binaries, docs and publish to dev folder
+on:
+  workflow_dispatch:
+jobs:
+  build-upload:
+    runs-on: ubuntu-latest
+    name: Build and upload Assets to Release
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.7"
+      - name: Set outputs
+        id: vars
+        run: echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install platformio requests shutils
+          npm install
+      - name: Set soft version tag from git
+        run: sed -i "s/version_tag/${steps.vars.outputs.sha_short}/g" main/User_config.h
+      - name: Run PlatformIO
+        run: platformio run
+      - name: Prepare Release Assets
+        run: |
+          sudo apt install rename
+          ./scripts/prepare_deploy.sh
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: "14.x"
+      - name: Set doc version tag from git
+        run: sed -i "s/version_tag/${{steps.vars.outputs.sha_short}}/g" docs/.vuepress/config.js
+      - name: Build documentation
+        run: |
+          python ./scripts/gen_wu_dev.py
+          npm run docs:build
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./docs/.vuepress/dist
+          destination_dir: dev
+          cname: docs.openmqttgateway.com