feat: Add temp dir option (#2891)

Co-authored-by: Valentin Maerten <maerten.valentin@gmail.com>

taskrc/ast/taskrc.go

@@ -19,6 +19,7 @@ type TaskRC struct {
 	Interactive  *bool           `yaml:"interactive"`
 	Remote       Remote          `yaml:"remote"`
 	Failfast     bool            `yaml:"failfast"`
+	TempDir      *string         `yaml:"temp-dir"`
 	Experiments  map[string]int  `yaml:"experiments"`
 }
 
@@ -70,4 +71,5 @@ func (t *TaskRC) Merge(other *TaskRC) {
 	t.Concurrency = cmp.Or(other.Concurrency, t.Concurrency)
 	t.Interactive = cmp.Or(other.Interactive, t.Interactive)
 	t.Failfast = cmp.Or(other.Failfast, t.Failfast)
+	t.TempDir = cmp.Or(other.TempDir, t.TempDir)
 }

taskrc/taskrc_test.go

@@ -112,6 +112,40 @@ func TestGetConfig_OnlyLocal(t *testing.T) { //nolint:paralleltest // cannot run
 	}, cfg)
 }
 
+func TestGetConfig_TempDir(t *testing.T) { //nolint:paralleltest // cannot run in parallel
+	_, _, localDir := setupDirs(t)
+
+	writeFile(t, localDir, ".taskrc.yml", `
+temp-dir: .task-cache
+`)
+
+	cfg, err := GetConfig(localDir)
+	require.NoError(t, err)
+	require.NotNil(t, cfg)
+	require.NotNil(t, cfg.TempDir)
+	assert.Equal(t, ".task-cache", *cfg.TempDir)
+}
+
+func TestGetConfig_TempDirMergePrecedence(t *testing.T) { //nolint:paralleltest // cannot run in parallel
+	xdgConfigDir, homeDir, localDir := setupDirs(t)
+
+	writeFile(t, xdgConfigDir, "taskrc.yml", `
+temp-dir: xdg-cache
+`)
+	writeFile(t, homeDir, ".taskrc.yml", `
+temp-dir: home-cache
+`)
+	writeFile(t, localDir, ".taskrc.yml", `
+temp-dir: local-cache
+`)
+
+	cfg, err := GetConfig(localDir)
+	require.NoError(t, err)
+	require.NotNil(t, cfg)
+	require.NotNil(t, cfg.TempDir)
+	assert.Equal(t, "local-cache", *cfg.TempDir)
+}
+
 func TestGetConfig_All(t *testing.T) { //nolint:paralleltest // cannot run in parallel
 	xdgConfigDir, homeDir, localDir := setupDirs(t)