fix(get_values): lowercase clean_branch_name outputs

Branches with uppercase characters (e.g. claude/move-mcp-server-cardRrDNj)
produced clean_branch_name / clean_branch_name_with_suffix values that
preserved case. Downstream consumers use these as Helm release names,
DNS hostnames, npm dist-tags and other identifiers that require lowercase,
so multi-staging deployments and canary npm publishes failed on such
branches (see apify/apify-core#27626).

Normalize to lowercase at the source so every consumer gets a
DNS-1123 / npm-safe slug without each call site re-implementing the fix.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: markubra

.github/workflows/get_values.yaml

@@ -19,10 +19,10 @@ on:
         description: Short commit sha
         value: ${{ jobs.get_values.outputs.short_commit_sha }}
       clean_branch_name:
-        description: Branch name stripped of non-alphanumeric characters and capped at length of 35
+        description: Branch name stripped of non-alphanumeric characters, lowercased, and capped at length of 35
         value: ${{ jobs.get_values.outputs.clean_branch_name }}
       clean_branch_name_with_suffix:
-        description: Branch name stripped of non-alphanumeric characters and capped at length of 28 concatenated with first 6 chars of branch SHA
+        description: Branch name stripped of non-alphanumeric characters, lowercased, and capped at length of 28 concatenated with first 6 chars of branch SHA
         value: ${{ jobs.get_values.outputs.clean_branch_name_with_suffix }}
       commit_author:
         description: Author of last commit
@@ -53,6 +53,7 @@ jobs:
           fi
 
           _BRANCH_NAME=${BRANCH_NAME//[^[:alnum:]]/}
+          _BRANCH_NAME=$(echo "${_BRANCH_NAME}" | tr '[:upper:]' '[:lower:]')
           CLEAN_BRANCH_NAME=$(echo ${_BRANCH_NAME} | cut -c 1-35)
           CLEAN_BRANCH_NAME_WITH_SUFFIX=$(echo ${_BRANCH_NAME} | cut -c 1-28)-$(echo ${_BRANCH_NAME} | shasum -a 1 | cut -c 1-6)