chore(ci): create git tag automatically on release

.github/workflows/data-curation.yml

@@ -55,3 +55,10 @@ jobs:
         run: |
           set -x
           ./scripts/upload
+
+      - name: create git tag
+        if: github.ref == 'refs/heads/staging'
+        run: |
+          set -x
+          git tag $(TZ=UTC date "+%Y-%m-%d--%H-%M-%S--%Z")
+          git push --tags

README.md

@@ -172,21 +172,6 @@ git checkout master
 
 It is often helpful to visualize the correctness of the branch state on every step by using a GUI git client, such as GitKraken, SourceTree, and [others](https://git-scm.com/downloads/guis).
 
-
-### Creating a git tag
-
-By convention, git tags are created on every release and the name of the tag consist of a date in format `YYYY-MM-DD` (e.g. `2021-11-18`). Updates of the staging branch don't need tags.
-
-Commands to create and push the tag:
-
-```bash
-# Create a tag locally
-git tag $(date '+%F')
-
-# Push the tags to the remote server
-git push --tags
-```
-
 ### Infrastructure
 
 AWS S3 buckets, AWS Cloudfront distributions, AWS Lambda and domain names are managed internally by Nextstrain AWS admins. Ping them on Slack if you need help.