fix: mask secrets on every path they leave a job (#1188)

A secret in a matrix value reached the log in the clear:

```yaml
strategy:
  matrix:
    include: "${{ github.token }}"
```

Chasing that one route is pointless, so this masks every sink a secret leaves a job by: the uploaded log rows and the on-disk `job.log`, both through one choke point in `appendLogRow`; the runner's own log, which is where planning errors like that one land with no job logger in reach; the job logger's stdout under debug logging; job summaries; job outputs; and the job name that becomes a container name.

Values the runner knows but the job never declared, the proxy password and the task token, are hidden the same way. Masks apply longest first, since `strings.Replacer` matches in argument order and one secret prefixing another would otherwise mask the prefix and print the rest.

### What changes for users

An output whose value carries a secret is skipped with a warning instead of sent, matching GitHub. Output that showed a secret now shows `***`. `ACTIONS_STEP_DEBUG` and `ACTIONS_RUNNER_DEBUG` are never masked, also matching GitHub, so an output of `true` still reaches the jobs that need it.

Each fix has a test that fails without it.

Reviewed-on: https://gitea.com/gitea/runner/pulls/1188
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

act/runner/job_executor_test.go

@@ -1096,3 +1096,37 @@ func TestJobSetContinueOnError(t *testing.T) {
 		assert.True(t, j.ContinueOnError)
 	})
 }
+
+func TestTryUploadJobSummaryMasksSecrets(t *testing.T) {
+	var got string
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		body, err := io.ReadAll(r.Body)
+		assert.NoError(t, err)
+		got = string(body)
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer server.Close()
+
+	cm := &containerMock{}
+	cm.On("GetContainerArchive", mock.Anything, "/var/run/act/workflow/step-summary-0.md").Return(
+		io.NopCloser(bytes.NewReader(tarArchive(t, tarEntry{
+			name: "step-summary-0.md", body: "deployed true with s3cr3t and runtime-added via pr0xypw",
+		}))),
+		nil,
+	).Once()
+
+	rc := newJobSummaryRC(map[string]string{
+		"GITEA_ACTIONS_CAPABILITIES": "job-summary",
+		"ACTIONS_RUNTIME_URL":        server.URL,
+		"ACTIONS_RUNTIME_TOKEN":      fakeRuntimeToken(34),
+		"GITEA_RUN_ID":               "12",
+	}, cm, 1)
+	rc.Config.Secrets = map[string]string{"TOK": "s3cr3t", "ACTIONS_STEP_DEBUG": "true"}
+	rc.Config.ExtraMasks = []string{"pr0xypw"}
+	rc.Masks = []string{"runtime-added"}
+
+	tryUploadJobSummary(context.Background(), rc)
+
+	assert.Equal(t, "deployed true with *** and *** via ***", got)
+	cm.AssertExpectations(t)
+}