github actions: Add kernelCI for rlc kernels

Similar to lts kernels, this adds supports for user branches on top
of rlc (8, 9, 10) versions.

Signed-off-by: Roxana Nicolescu <rnicolescu@ciq.com>

Author: roxanan1996

.github/workflows/kernel-build-and-test-multiarch.yml

@@ -343,13 +343,27 @@ jobs:
           BASE_BRANCH="${{ github.base_ref }}"
           echo "Using PR base branch: $BASE_BRANCH"
         else
-          # Extract base branch from branch name pattern: {name}_base or {name}-base
-          # Match patterns like {shreeya}_ciqlts9_2 or {shreeya}-ciqlts9_2
-          if [[ "$BRANCH_NAME" =~ \{[^}]+\}[_-](.+) ]]; then
+          # Extract base branch from branch name.
+          # Two supported patterns (both require curly-brace {USER} prefix):
+          #
+          #   1. RLC pattern  : {user}_rlc-N/VERSION
+          #      e.g. {shreeya}_rlc-10/6.12.0-124.2.1.el10_1
+          #      Base branch  : rlc-N/VERSION  (everything after the first '_')
+          #      No whitelist validation — the version string is the base.
+          #
+          #   2. Legacy pattern: {user}_BASE  or  {user}-BASE
+          #      e.g. {shreeya}_ciqlts9_2
+          #      Base branch  : BASE  (must be in VALID_BASES whitelist)
+
+          if [[ "$BRANCH_NAME" =~ ^\{[^}]+\}_(rlc-[0-9]+/.+)$ ]]; then
+            # RLC pattern: base is rlc-N/VERSION
+            BASE_BRANCH="${BASH_REMATCH[1]}"
+            echo "Detected RLC branch pattern, base branch: $BASE_BRANCH"
+          elif [[ "$BRANCH_NAME" =~ \{[^}]+\}[_-](.+) ]]; then
+            # Legacy pattern: validate against whitelist
             EXTRACTED_BASE="${BASH_REMATCH[1]}"
             echo "Extracted base branch from branch name: $EXTRACTED_BASE"
 
-            # Validate against whitelist
             if echo "$VALID_BASES" | grep -wq "$EXTRACTED_BASE"; then
               BASE_BRANCH="$EXTRACTED_BASE"
               echo "Base branch validated: $BASE_BRANCH"
@@ -359,8 +373,9 @@ jobs:
               exit 1
             fi
           else
-            echo "::error::Branch name does not match expected pattern {name}_base or {name}-base"
-            echo "::error::Branch name must be in format {name}_base or {name}-base where base is one of: $VALID_BASES"
+            echo "::error::Branch name does not match any known pattern"
+            echo "::error::  Legacy pattern : {user}_BASE or {user}-BASE  (BASE must be one of: $VALID_BASES)"
+            echo "::error::  RLC pattern    : {user}_rlc-N/VERSION  (e.g. {user}_rlc-10/6.12.0-124.2.1.el10_1)"
             exit 1
           fi
         fi
@@ -409,9 +424,11 @@ jobs:
             continue
           fi
 
-          # Extract base from branch name pattern {name}_base or {name}-base
+          # Extract base from branch name — support both legacy and RLC patterns
           EXTRACTED_BASE=""
-          if [[ "$HEAD_BRANCH" =~ \{[^}]+\}[_-](.+) ]]; then
+          if [[ "$HEAD_BRANCH" =~ ^\{[^}]+\}_(rlc-[0-9]+/.+)$ ]]; then
+            EXTRACTED_BASE="${BASH_REMATCH[1]}"
+          elif [[ "$HEAD_BRANCH" =~ \{[^}]+\}[_-](.+) ]]; then
             EXTRACTED_BASE="${BASH_REMATCH[1]}"
           fi
 
@@ -539,9 +556,11 @@ jobs:
     if: success() || failure()
 
     steps:
-    - name: Check if branch name contains curly brackets
+    - name: Check if branch name matches a supported pattern
       run: |
         BRANCH_NAME="${{ github.ref_name }}"
+        # Accept any branch whose name contains curly braces (covers both
+        # legacy {user}_BASE and RLC {user}_rlc-N/VERSION patterns)
         if [[ ! "$BRANCH_NAME" =~ \{ ]] || [[ ! "$BRANCH_NAME" =~ \} ]]; then
           echo "Branch name '$BRANCH_NAME' does not contain curly brackets, skipping PR creation"
           exit 1