Add origami-version GitHub Action

When this is merged, we can have automated releases by using the release-type labels "major"/"minor"/"patch" on a pull-request before merging the pull-request.

.github/workflows/automatic-tag-and-release.yml

@@ -0,0 +1,20 @@
+on:
+  pull_request:
+    types: [closed] # Merged pull-requests count as closed pull-requests.
+
+jobs:
+  create-new-version:
+    runs-on: ubuntu-latest
+    name: Create new version/tag
+    steps:
+      - uses: actions/checkout@v2
+        if: github.event.pull_request.merged # Only run on merged pull-requests
+        with:
+          ref: ${{ github.event.pull_request.merge_commit_sha }} # Checkout the merged commit
+          fetch-depth: 0
+      - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/* # Get all tags from the origin
+      - uses: Financial-Times/origami-version@v1
+        name: Create new version/tag
+        if: github.event.pull_request.merged  # Only run on merged pull-requests
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}