Release v0.2.2 (grafana/cortex-tools#56)

* Release version v0.2.2

* Modify the image tag to tag the images accordingly to the branch name

We'll use the branch name as the image tag as long as it matches a
semantic version with a prefix of `v`.

* Wordsmith changelog entries

cmd/cortextool/CHANGELOG.md

@@ -2,12 +2,16 @@
 
 ## unreleased / master
 
-* [BUGFIX] Fix usage of the old PromQL parser in `prepare lint`.
+## v0.2.2 / 2020-06-09
+
+* [BUGFIX] Remove usage of alternate PromQL parser in `rules prepare lint`.
+* [BUGFIX] `rules check` does not require an argument.
 
 ## v0.2.1 / 2020-06-08
 
 * [FEATURE] Add `rules check` command. It runs various [best practice](https://prometheus.io/docs/practices/rules/) checks against rules.
 * [ENHANCEMENT] Ensure `rules prepare` takes into account Vector Matching on PromQL Binary Expressions.
+* [BUGFIX] `rules prepare` and `rules lint` do not require an argument.
 
 ## v0.2.0 / 2020-06-02
 

cmd/cortextool/tools/image-tag

@@ -6,4 +6,10 @@ set -o pipefail
 
 WORKING_SUFFIX=$(if git status --porcelain | grep -qE '^(?:[^?][^ ]|[^ ][^?])\s'; then echo "-WIP"; else echo ""; fi)
 BRANCH_PREFIX=$(git rev-parse --abbrev-ref HEAD)
-echo "${BRANCH_PREFIX//\//-}-$(git rev-parse --short HEAD)$WORKING_SUFFIX"
+
+if [[ $BRANCH_PREFIX =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+)$ ]];
+then
+  echo $BRANCH_PREFIX
+else
+  echo "${BRANCH_PREFIX//\//-}-$(git rev-parse --short HEAD)$WORKING_SUFFIX"
+fi