Change build version format to include 'dev' (#3982)

* Change build version format to include 'dev'

* Fix version formatting in append-build-id.sh

* Fix version string to use valid semver build metadata separator

+dev+<sha> is not valid semver; build metadata fields must be dot-separated.
Change to +dev.<sha> so the semantic_version library accepts it.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: bm1549

.gitlab/append-build-id.sh

@@ -25,7 +25,7 @@ else
     parts[2]=0
     version=$(export IFS=.; (echo "${parts[*]}"))
   fi
-  version="$version+$githash"
+  version="$version+dev.$githash"
   echo -n "$version" > VERSION
   echo "Set version number to $version."
 fi