feat(actions): implement jobs.<job_id>.continue-on-error (#38100)

Support `continue-on-error` for workflow jobs when aggregating an
Actions workflow run status.

Previously, `continue-on-error` was parsed from workflow YAML but was
not persisted or used when calculating the overall run result. As a
result, a failed job could incorrectly fail the entire workflow even
when the workflow explicitly allowed that job to fail.

This PR stores the parsed `continue-on-error` value on each action run
job and treats failed jobs with `continue-on-error: true` as successful
when computing the workflow run status, matching GitHub Actions
behavior.

## Changes

- Add `ContinueOnError` to `jobparser.Job`.
- Add `continue_on_error` to `ActionRunJob` with a `NOT NULL DEFAULT
FALSE` migration.
- Populate `ActionRunJob.ContinueOnError` when creating workflow run
jobs.
- Update workflow status aggregation so failed `continue-on-error` jobs
do not fail the overall run.
- Leave `resolveCheckNeeds` unchanged so dependent jobs still see the
job result as `failure` and are skipped by default.

## Compatibility

This is backward compatible.

If only the runner or only the server is updated, `continue-on-error`
continues to degrade to the previous behavior and is effectively ignored
until both sides support it.

Related runner PR: https://gitea.com/gitea/runner/pulls/1032

---------

Signed-off-by: bircni <bircni@icloud.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

models/actions/status_test.go

@@ -48,3 +48,57 @@ func TestStatusFromResult(t *testing.T) {
 		assert.Equal(t, tt.want, StatusFromResult(tt.result), "result=%s", tt.result)
 	}
 }
+
+func newJob(status Status, continueOnError bool) *ActionRunJob {
+	return &ActionRunJob{Status: status, ContinueOnError: continueOnError}
+}
+
+func TestAggregateJobStatusContinueOnError(t *testing.T) {
+	cases := []struct {
+		name string
+		jobs []*ActionRunJob
+		want Status
+	}{
+		{
+			name: "all success",
+			jobs: []*ActionRunJob{newJob(StatusSuccess, false), newJob(StatusSuccess, false)},
+			want: StatusSuccess,
+		},
+		{
+			name: "one failure without continue-on-error",
+			jobs: []*ActionRunJob{newJob(StatusSuccess, false), newJob(StatusFailure, false)},
+			want: StatusFailure,
+		},
+		{
+			name: "one failure with continue-on-error",
+			jobs: []*ActionRunJob{newJob(StatusSuccess, false), newJob(StatusFailure, true)},
+			want: StatusSuccess,
+		},
+		{
+			name: "only continued-failure",
+			jobs: []*ActionRunJob{newJob(StatusFailure, true)},
+			want: StatusSuccess,
+		},
+		{
+			name: "continued-failure plus real failure",
+			jobs: []*ActionRunJob{newJob(StatusFailure, true), newJob(StatusFailure, false)},
+			want: StatusFailure,
+		},
+		{
+			name: "all skipped",
+			jobs: []*ActionRunJob{newJob(StatusSkipped, false), newJob(StatusSkipped, false)},
+			want: StatusSkipped,
+		},
+		{
+			name: "continued-failure plus skipped counts as success",
+			jobs: []*ActionRunJob{newJob(StatusFailure, true), newJob(StatusSkipped, false)},
+			want: StatusSuccess,
+		},
+	}
+
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.want, AggregateJobStatus(tt.jobs))
+		})
+	}
+}