Documentation Update: Properly create tags and aliases, add workflow to delete unwanted / old versions (#1355)

Signed-off-by: Mario Sarcher <msarcher@mirantis.com>

Documentation: only create new tag and update alias "latest" on release publish (not for pre-releases), master contains always the docs generated from last master branch commit

Signed-off-by: Mario Sarcher <msarcher@mirantis.com>

Documentation: only create new tag and update alias "latest" on release publish (not for pre-releases), master contains always the docs generated from last master branch commit

Signed-off-by: Mario Sarcher <msarcher@mirantis.com>

Generate pre-release docs until Lens 4.0.0 is GA, see #1408

Signed-off-by: Mario Sarcher <msarcher@mirantis.com>

Co-authored-by: Mario Sarcher <msarcher@mirantis.com>

.github/workflows/mkdocs-delete-version.yml

@@ -0,0 +1,38 @@
+name: Delete Documentation Version
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version string to be deleted (e.g."v0.0.1")'
+        required: true
+jobs:
+  build:
+    name: Delete docs Version
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install git+https://${{ secrets.GH_TOKEN }}@github.com/lensapp/mkdocs-material-insiders.git
+          pip install mike
+          
+      - name: Checkout Release from lens
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: git config
+        run: |
+           git config --local user.email "action@github.com"
+           git config --local user.name "GitHub Action"
+
+
+      - name: mkdocs delete version
+        run: |
+           mike delete --push ${{ github.event.inputs.version }}
+