ensure deprecation warning is only shown once per job

lib/util.js

@@ -755,7 +755,9 @@ exports.checkDiskUsage = checkDiskUsage;
  * to upgrade to v3.
  */
 function checkActionVersion(version, githubVersion) {
-    if (!semver.satisfies(version, ">=3")) {
+    if (!semver.satisfies(version, ">=3") && // do not warn if the customer is already running v3
+        !process.env.CODEQL_V2_DEPRECATION_WARNING // do not warn if we have already warned
+    ) {
         // Only log a warning for versions of GHES that are compatible with CodeQL Action version 3.
         //
         // GHES 3.11 shipped without the v3 tag, but it also shipped without this warning message code.
@@ -768,6 +770,8 @@ function checkActionVersion(version, githubVersion) {
             core.warning("CodeQL Action v2 will be deprecated on December 5th, 2024. Please upgrade to v3. For " +
                 "more information, see " +
                 "https://github.blog/changelog/2024-01-12-code-scanning-deprecation-of-codeql-action-v2/");
+            // set CODEQL_V2_DEPRECATION_WARNING env var to prevent the warning from being logged multiple times
+            core.exportVariable("CODEQL_V2_DEPRECATION_WARNING", "true");
         }
     }
 }

lib/util.test.js

@@ -342,6 +342,8 @@ for (const [version, githubVersion, shouldReportWarning,] of CHECK_ACTION_VERSIO
         const versionStub = sinon
             .stub(api, "getGitHubVersion")
             .resolves(githubVersion);
+        // call checkActionVersion twice and assert below that warning is reported only once
+        util.checkActionVersion(version, await api.getGitHubVersion());
         util.checkActionVersion(version, await api.getGitHubVersion());
         if (shouldReportWarning) {
             t.true(warningSpy.calledOnceWithExactly(sinon.match("CodeQL Action v2 will be deprecated")));