snapshot uploading: log both ahead/behind by numbers

This should help with debugging in the future, should the need arise
again.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

GitForWindowsHelper/cascading-runs.js

@@ -166,15 +166,15 @@ const cascadingRuns = async (context, req) => {
 
             // Next, check that the commit is on the `main` branch
             const gitToken = await getToken(context, checkRunOwner, checkRunRepo)
-            const { ahead_by } = await githubApiRequest(
+            const { ahead_by, behind_by } = await githubApiRequest(
                 context,
                 gitToken,
                 'GET',
                 `/repos/${checkRunOwner}/${checkRunRepo}/compare/HEAD...${commit}`,
                 // `/repos/dscho/git/compare/HEAD...${commit}`,
             )
             if (ahead_by > 0) {
-                return `Ignoring ${name} check-run because its corresponding commit ${commit} is not on the main branch`
+                return `Ignoring ${name} check-run because its corresponding commit ${commit} is not on the main branch (ahead by ${ahead_by}, behind by ${behind_by})`
             }
 
             const workFlowRunIDs = {}
@@ -246,7 +246,7 @@ const cascadingRuns = async (context, req) => {
                 }
             )
 
-            return `The 'upload-snapshot' workflow run was started at ${answer.html_url}`
+            return `The 'upload-snapshot' workflow run was started at ${answer.html_url} (ahead by ${ahead_by}, behind by ${behind_by})`
         }
         return `Not a cascading run: ${name}; Doing nothing.`
     }

__tests__/index.test.js

@@ -175,7 +175,7 @@ The \`git-artifacts-aarch64\` workflow run [was started](dispatched-workflow-git
     }
     if (method === 'GET' && requestPath ===
         '/repos/git-for-windows/git/compare/HEAD...0c796d3013a57e8cc894c152f0200107226e5dd1') {
-        return { ahead_by: 0 }
+        return { ahead_by: 0, behind_by: 99 }
     }
     throw new Error(`Unhandled ${method}-${requestPath}-${JSON.stringify(payload)}`)
 })
@@ -994,7 +994,7 @@ test('the third completed `git-artifacts-<arch>` check-run triggers an `upload-s
     try {
         expect(await index(context, context.req)).toBeUndefined()
         expect(context.res).toEqual({
-            body: `The 'upload-snapshot' workflow run was started at dispatched-workflow-upload-snapshot.yml`,
+            body: `The 'upload-snapshot' workflow run was started at dispatched-workflow-upload-snapshot.yml (ahead by 0, behind by 99)`,
             headers: undefined,
             status: undefined
         })