Don't run packaging snapshot with prereleases (#42326) (#42333)

This fixes a small bug related to #42304 ; when we (manually)
trigger prerelease builds (by setting VERSION_QUALIFIER="...") we
only want them to trigger staging builds and skip snapshot builds.

(cherry picked from commit a122a9f)

Co-authored-by: Dimitrios Liappis <[email protected]>

.buildkite/packaging.pipeline.yml

@@ -17,7 +17,7 @@ steps:
   # this prevents parallel builds and possibility of publishing out of order DRA artifacts if the first job takes longer than the second
 
   - name: Start of concurrency group for DRA Snapshot
-    if: build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true"
+    if: (build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true") && build.env('VERSION_QUALIFIER') == null
     command: echo "--> Start of concurrency gate dra-snapshot"
     concurrency_group: "dra-gate-snapshot-$BUILDKITE_BRANCH"
     concurrency: 1
@@ -38,7 +38,7 @@ steps:
     key: dashboards
     steps:
       - label: Snapshot dashboards
-        if: build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true"
+        if: (build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true") && build.env('VERSION_QUALIFIER') == null
         depends_on: start-gate-snapshot
         key: dashboards-snapshot
         # TODO: container with go and make
@@ -83,7 +83,7 @@ steps:
           - build/distributions/**/*
 
   - group: Packaging snapshot
-    if: build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true"
+    if: (build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true") && build.env('VERSION_QUALIFIER') == null
     key: packaging-snapshot
     depends_on: start-gate-snapshot
     steps:
@@ -263,7 +263,7 @@ steps:
     steps:
       - label: DRA Snapshot
         ## Only for release branches and main
-        if: build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true"
+        if: (build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true") && build.env('VERSION_QUALIFIER') == null
         key: dra-snapshot
         env:
           DRA_WORKFLOW: snapshot
@@ -302,13 +302,13 @@ steps:
   - wait
 
   - command: echo "End of concurrency gate dra-snapshot <--"
-    if: build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true"
+    if: (build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.branch == 'main' || build.env('RUN_SNAPSHOT') == "true") && build.env('VERSION_QUALIFIER') == null
     concurrency_group: "dra-gate-snapshot-$BUILDKITE_BRANCH"
     concurrency: 1
     key: end-gate-snapshot
 
   - command: echo "End of concurrency gate dra-staging <--"
-    if: build.branch =~ /^[0-9]+\.[0-9x]+\$/
+    if: build.branch =~ /^[0-9]+\.[0-9x]+\$/ || build.env('VERSION_QUALIFIER') != null
     concurrency_group: "dra-gate-staging-$BUILDKITE_BRANCH"
     concurrency: 1
     key: end-gate-staging