Add workflow for creating release on the merging of a release PR

Signed-off-by: Sebastian Malton <sebastian@malton.name>

.github/workflows/release.yml

@@ -0,0 +1,30 @@
+name: Release Open Lens
+on:
+  pull_request:
+    types:
+      - closed
+    branches:
+      - master
+      - release/v*.*
+jobs:
+  release:
+    name: Release
+    if: ${{ github.event.pull_request.merged == 'true' && contains(github.event.pull_request.labels.*.name, 'release') }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Release from lens
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: butlerlogic/action-autotag@stable
+        id: tagger
+        with:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          tag_prefix: "v"
+      - uses: ncipollo/release-action@v1
+        if: ${{ needs.tag.outputs.tagname != '' }}
+        with:
+          name: v${{ steps.open-lens-version.outputs.VERSION }}
+          commit: master
+          tag: v${{ steps.open-lens-version.outputs.VERSION }}
+          body: ${{ github.event.pull_request.body }}