[CI] Update sycl-rel-nightly-launch.yml (#19742)

Currently there are two release branches and both of them should be
tested with Nightly.

Author: KornevNikita

.github/workflows/sycl-rel-nightly-launch.yml

@@ -17,23 +17,29 @@ jobs:
     permissions:
       actions: write
     runs-on: ubuntu-latest
+    strategy:
+      # Keep the matrix even if there is only one branch.
+      matrix:
+        branch: [sycl-rel-6_2, sycl-rel-6_3]
     steps:
-      - name: Launch
+      - name: Launch for ${{ matrix.branch }}
         env:
           GH_TOKEN: ${{ github.token }}
-        # To avoid excessive scheduled runs this script also checks if there are
-        # new commits since the last run - it checks if the latest commit is
-        # older >24h. That means the previous run already tested this commit.
+          BRANCH: ${{ matrix.branch }}
+        # To avoid excessive runs this script checks if there are new commits
+        # since the last run - it checks if the latest commit is older >24h.
+        # That means the previous run has already tested this commit.
         run: |
+          BRANCH="${{ matrix.branch }}"
           if [ "$GITHUB_EVENT_NAME" = "schedule" ]; then
-            latest_commit_time=$(curl -s -H "Authorization: token $GH_TOKEN" https://api.github.com/repos/intel/llvm/commits/sycl-rel-6_2 | jq -r '.commit.committer.date')
+            latest_commit_time=$(curl -s -H "Authorization: token $GH_TOKEN" https://api.github.com/repos/intel/llvm/commits/{$BRANCH} | jq -r '.commit.committer.date')
             echo $latest_commit_time
             latest_commit_epoch=$(date -d "$latest_commit_time" +%s)
             now_epoch=$(date +%s)
             diff=$((now_epoch - latest_commit_epoch))
             if [ "$diff" -lt 86400 ]; then
-              gh workflow run sycl-rel-nightly.yml --repo "${GITHUB_REPOSITORY}" --ref sycl-rel-6_2
+              gh workflow run sycl-rel-nightly.yml --repo "${GITHUB_REPOSITORY}" --ref "${BRANCH}"
             fi
           else
-            gh workflow run sycl-rel-nightly.yml --repo "${GITHUB_REPOSITORY}" --ref sycl-rel-6_2
+            gh workflow run sycl-rel-nightly.yml --repo "${GITHUB_REPOSITORY}" --ref "${BRANCH}"
           fi

.github/workflows/sycl-rel-nightly.yml

@@ -1,5 +1,6 @@
-# The actual version of this workflow can be found on the latest sycl-rel-*
-# branch. This file is still needed to launch the workflow on another branches.
+# The actual version of this file can be found on the latest sycl-rel-* branch.
+# A new release branch copies this file from the latest release branch.
+# This file is still needed to launch the workflow on another branches.
 
 name: SYCL Release Branch Nightly