tools: add a check for clean git tree after tests

Signed-off-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
PR-URL: #62661
Refs: #62646
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>

Author: aduh95

.github/workflows/test-linux.yml

@@ -77,9 +77,14 @@ jobs:
       - name: Environment Information
         run: npx envinfo
       - name: Build
-        run: make -C node build-ci -j4 V=1 CONFIG_FLAGS="--error-on-warn --v8-enable-temporal-support"
+        working-directory: node
+        run: make build-ci -j4 V=1 CONFIG_FLAGS="--error-on-warn --v8-enable-temporal-support"
       - name: Test
-        run: make -C node test-ci -j1 V=1 TEST_CI_ARGS="-p actions --measure-flakiness 9"
+        working-directory: node
+        run: make test-ci -j1 V=1 TEST_CI_ARGS="-p actions --measure-flakiness 9"
+      - name: Ensure running tests did not cause any change in the tree
+        working-directory: node
+        run: git add -A && git diff --name-only --exit-code --staged
       - name: Re-run test in a folder whose name contains unusual chars
         run: |
           mv node "$DIR"