Make the date part of the semver

Container images will now be called things like
`8.0.23.20220527-ps-sha4567`

Author: piki

.buildkite/hooks/pre-command

@@ -1,16 +1,20 @@
 set -eu
 
+TODAY=$(date +"%Y%m%d")
+[ -n "$TODAY" ]
+echo "Today = \"${TODAY}\""
+
 git log -25000 --format='%H' | sort > tmp-log
 git show-ref | grep tags/mysql-8 | sort > tmp-tags
 export CONTAINER_SEMVER=$(join tmp-log tmp-tags | sort -t. -n -k3 | tail -1 | cut -d- -f2)
+[ -n "$CONTAINER_SEMVER" ]
+export CONTAINER_SEMVER="$CONTAINER_SEMVER.$TODAY"
 echo "Semantic version = \"${CONTAINER_SEMVER}\""
 
 export CONTAINER_SHORT_SHA=$(git log -1 --pretty='%h')
+[ -n "$CONTAINER_SHORT_SHA" ]
 echo "Short SHA = \"${CONTAINER_SHORT_SHA}\""
 
 export CONTAINER_BRANCH_NAME=$(echo "$BUILDKITE_BRANCH" | sed -e 's/[\/:]/_/g')
-echo "Safe branch name = \"${CONTAINER_BRANCH_NAME}\""
-
-[ -n "$CONTAINER_SEMVER" ]
-[ -n "$CONTAINER_SHORT_SHA" ]
 [ -n "$CONTAINER_BRANCH_NAME" ]
+echo "Safe branch name = \"${CONTAINER_BRANCH_NAME}\""