fix: reduce redundant git-call-failed log messages in upload-sarif

Change the log level of the "git call failed." message in `runGitCommand`
from `core.info` to `core.debug` so repeated identical failures in
non-git working directories no longer flood the normal output. Add a
single `core.info` fallback notice in `getCommitOid` so callers still
see one actionable message when git is unavailable. Update tests to
assert the new debug-level logging.

Fixes #3383

Author: mvanhorn

lib/entry-points.js

@@ -252,6 +252,7 @@ test.serial(
   "determineBaseBranchHeadCommitOid not git repository",
   async (t) => {
     const infoStub = sinon.stub(core, "info");
+    const debugStub = sinon.stub(core, "debug");
 
     process.env["GITHUB_EVENT_NAME"] = "pull_request";
     process.env["GITHUB_SHA"] = "100912429fab4cb230e66ffb11e738ac5194e73a";
@@ -260,32 +261,34 @@ test.serial(
       await gitUtils.determineBaseBranchHeadCommitOid(tmpDir);
     });
 
-    t.deepEqual(1, infoStub.callCount);
-    t.deepEqual(
-      infoStub.firstCall.args[0],
-      "git call failed. Will calculate the base branch SHA on the server. Error: " +
-        "The checkout path provided to the action does not appear to be a git repository.",
+    t.deepEqual(0, infoStub.callCount);
+    t.assert(
+      debugStub.calledWithMatch(
+        "git call failed. Will calculate the base branch SHA on the server. Error: " +
+          "The checkout path provided to the action does not appear to be a git repository.",
+      ),
     );
   },
 );
 
 test.serial("determineBaseBranchHeadCommitOid other error", async (t) => {
   const infoStub = sinon.stub(core, "info");
+  const debugStub = sinon.stub(core, "debug");
 
   process.env["GITHUB_EVENT_NAME"] = "pull_request";
   process.env["GITHUB_SHA"] = "100912429fab4cb230e66ffb11e738ac5194e73a";
   const result = await gitUtils.determineBaseBranchHeadCommitOid(
     path.join(__dirname, "../../i-dont-exist"),
   );
   t.deepEqual(result, undefined);
-  t.deepEqual(1, infoStub.callCount);
+  t.deepEqual(0, infoStub.callCount);
   t.assert(
-    infoStub.firstCall.args[0].startsWith(
+    debugStub.calledWithMatch(
       "git call failed. Will calculate the base branch SHA on the server. Error: ",
     ),
   );
   t.assert(
-    !infoStub.firstCall.args[0].endsWith(
+    !debugStub.firstCall.args[0].endsWith(
       "The checkout path provided to the action does not appear to be a git repository.",
     ),
   );

src/git-utils.test.ts

@@ -92,7 +92,7 @@ export const runGitCommand = async function (
       reason =
         "The checkout path provided to the action does not appear to be a git repository.";
     }
-    core.info(`git call failed. ${customErrorMessage} Error: ${reason}`);
+    core.debug(`git call failed. ${customErrorMessage} Error: ${reason}`);
     throw error;
   }
 };
@@ -119,6 +119,9 @@ export const getCommitOid = async function (
     );
     return stdout.trim();
   } catch {
+    core.info(
+      "Could not retrieve commit SHA from git; falling back to environment.",
+    );
     return getOptionalInput("sha") || getRequiredEnvParam("GITHUB_SHA");
   }
 };