git package - add keepGitDir option

Signed-off-by: Guillaume de Rouville <guillaume.derouville@gmail.com>

stdlib/git/tests/git.cue

@@ -6,18 +6,19 @@ import (
 	"alpha.dagger.io/git"
 	"alpha.dagger.io/alpine"
 	"alpha.dagger.io/os"
-	"alpha.dagger.io/dagger/op"
 )
 
 repo: git.#Repository & {
-	remote: "https://github.com/blocklayerhq/acme-clothing.git"
-	ref:    "master"
+	remote:     "https://github.com/blocklayerhq/acme-clothing.git"
+	ref:        "master"
+	keepGitDir: true
+}
 
-	#up: [
-		op.#FetchGit & {
-			keepGitDir: true
-		},
-	]
+repoSubDir: git.#Repository & {
+	remote:     "https://github.com/dagger/examples.git"
+	ref:        "main"
+	subdir:     "todoapp"
+	keepGitDir: true
 }
 
 branch: git.#CurrentBranch & {
@@ -40,6 +41,18 @@ TestRepository: os.#Container & {
 		"""
 }
 
+TestSubRepository: os.#Container & {
+	image: alpine.#Image & {
+		package: bash: "=5.1.0-r0"
+		package: git:  true
+	}
+	mount: "/repo1": from: repoSubDir
+	dir: "/repo1"
+	command: """
+		[ -d src ]
+		"""
+}
+
 TestCurrentBranch: os.#Container & {
 	image: alpine.#Image & {
 		package: bash: "=5.1.0-r0"