tests: added tests for keepgitdir

Signed-off-by: Sam Alba <sam.alba@gmail.com>

tests/ops/fetch-git/gitdir/main.cue

@@ -0,0 +1,35 @@
+package testing
+
+import "dagger.io/dagger/op"
+
+repo1: #up: [
+	op.#FetchGit & {
+		remote: "https://github.com/blocklayerhq/acme-clothing.git"
+		ref:    "master"
+	},
+]
+
+repo2: #up: [
+	op.#FetchGit & {
+		remote:     "https://github.com/blocklayerhq/acme-clothing.git"
+		ref:        "master"
+		keepGitDir: true
+	},
+]
+
+#up: [
+	op.#FetchContainer & {
+		ref: "alpine"
+	},
+	op.#Exec & {
+		args: ["sh", "-c", """
+			set -eu
+			[ ! -d /repo1/.git ]
+			[ -d /repo2/.git ]
+			"""]
+		mount: {
+			"/repo1": from: repo1
+			"/repo2": from: repo2
+		}
+	},
+]