fix: only generate date tag for main branch

.github/workflows/build.yml

@@ -33,13 +33,14 @@ jobs:
         id: generate-tags
         shell: bash
         run: |
-          echo "date=$(date +%Y%m%d)" >> $GITHUB_OUTPUT
           echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
-
           alias_tags=()
+          # Only perform the follow code when the action is spawned from a Pull Request
           if [[ "${{ github.event_name }}" == "pull_request" ]]; then
             alias_tags+=("pr-${{ github.event.number }}")
           else
+            # The following is run when the timer is triggered or a merge/push to main
+            echo "date=$(date +%Y%m%d)" >> $GITHUB_OUTPUT
             alias_tags+=("${{ matrix.major_version }}")
             if [[ "${{ matrix.is_latest }}" == "true" ]]; then
               alias_tags+=("latest")