ci: add a problem matcher for GitHub Actions

With this patch, test failures will be annotated with a helpful,
clickable message in GitHub Actions. For details, see
https://github.com/actions/toolkit/blob/master/docs/problem-matchers.md

Note: we need to set `TEST_SHELL_PATH` to Bash so that the problem
matcher is fed a file and line number for each test failure.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/ci/git-problem-matcher.json b/ci/git-problem-matcher.json
new file mode 100644
index 0000000000..506dfbd97f
--- /dev/null
+++ b/ci/git-problem-matcher.json
@@ -0,0 +1,16 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "git-test-suite",
+            "pattern": [
+                {
+                    "regexp": "^([^ :]+\\.sh):(\\d+): (error|warning|info):\\s+(.*)$",
+                    "file": 1,
+                    "line": 2,
+                    "severity": 3,
+                    "message": 4
+                }
+            ]
+        }
+    ]
+}