[ty] Link directly to typing conformance test suite when commenting the diff (#19736)

.github/workflows/typing_conformance.yaml

@@ -24,6 +24,7 @@ env:
   CARGO_TERM_COLOR: always
   RUSTUP_MAX_RETRIES: 10
   RUST_BACKTRACE: 1
+  CONFORMANCE_SUITE_COMMIT: d4f39b27a4a47aac8b6d4019e1b0b5b3156fabdc
 
 jobs:
   typing_conformance:
@@ -40,7 +41,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           repository: python/typing
-          ref: d4f39b27a4a47aac8b6d4019e1b0b5b3156fabdc
+          ref: ${{ env.CONFORMANCE_SUITE_COMMIT }}
           path: typing
           persist-credentials: false
 
@@ -95,6 +96,7 @@ jobs:
           fi
 
           echo ${{ github.event.number }} > pr-number
+          echo "${CONFORMANCE_SUITE_COMMIT}" > conformance-suite-commit
 
       - name: Upload diff
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
@@ -107,3 +109,9 @@ jobs:
         with:
           name: pr-number
           path: pr-number
+
+      - name: Upload conformance suite commit
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        with:
+          name: conformance-suite-commit
+          path: conformance-suite-commit

.github/workflows/typing_conformance_comment.yaml

@@ -32,6 +32,22 @@ jobs:
             echo "pr-number=$(<pr-number)" >> "$GITHUB_OUTPUT"
           fi
 
+      - uses: dawidd6/action-download-artifact@20319c5641d495c8a52e688b7dc5fada6c3a9fbc # v8
+        name: Download typing conformance suite commit
+        with:
+          name: conformance-suite-commit
+          run_id: ${{ github.event.workflow_run.id ||  github.event.inputs.workflow_run_id }}
+          if_no_artifact_found: ignore
+          allow_forks: true
+
+      - name: Parse conformance suite commit
+        id: conformance-suite-commit
+        run: |
+          if [[ -f conformance-suite-commit ]]
+          then
+            echo "CONFORMANCE_SUITE_COMMIT=$(<conformance-suite-commit)" >> "$GITHUB_OUTPUT"
+          fi
+
       - uses: dawidd6/action-download-artifact@20319c5641d495c8a52e688b7dc5fada6c3a9fbc # v8
         name: "Download typing_conformance results"
         id: download-typing_conformance_diff
@@ -61,7 +77,7 @@ jobs:
           # subsequent runs
           echo '<!-- generated-comment typing_conformance_diagnostics_diff -->' >> comment.txt
 
-          echo '## Diagnostic diff on typing conformance tests' >> comment.txt
+          echo "## Diagnostic diff on [typing conformance tests](https://github.com/python/typing/tree/${CONFORMANCE_SUITE_COMMIT}/conformance)" >> comment.txt
           if [ -s "pr/typing_conformance_diagnostics_diff/typing_conformance_diagnostics.diff" ]; then
             echo '<details>' >> comment.txt
             echo '<summary>Changes were detected when running ty on typing conformance tests</summary>' >> comment.txt