cue modules: move stdlib to pkg/alpha.dagger.io

In preparation for Europa, we will vendor multiple CUE modules:

- `pkg/alpha.dagger.io`: legacy non-europa packages
- `pkg/dagger.io`: core Europa packages
- `pkg/universe.dagger.io`: Europa universe

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

pkg/alpha.dagger.io/git/tests/git/git.cue

@@ -0,0 +1,111 @@
+package git
+
+import (
+	"strings"
+
+	"alpha.dagger.io/alpine"
+	"alpha.dagger.io/dagger"
+	"alpha.dagger.io/os"
+)
+
+repo: #Repository & {
+	remote:     "https://github.com/blocklayerhq/acme-clothing.git"
+	ref:        "master"
+	keepGitDir: true
+}
+
+repoSubDir: #Repository & {
+	remote:     "https://github.com/dagger/examples.git"
+	ref:        "main"
+	subdir:     "todoapp"
+	keepGitDir: true
+}
+
+branch: #CurrentBranch & {
+	repository: repo
+}
+
+tagsList: #Tags & {
+	repository: repo
+}
+
+TestRepository: os.#Container & {
+	image: alpine.#Image & {
+		package: bash: true
+		package: git:  true
+	}
+	mount: "/repo1": from: repo
+	dir: "/repo1"
+	command: """
+		[ -d .git ]
+		"""
+}
+
+TestSubRepository: os.#Container & {
+	image: alpine.#Image & {
+		package: bash: true
+		package: git:  true
+	}
+	mount: "/repo1": from: repoSubDir
+	dir: "/repo1"
+	command: """
+		[ -d src ]
+		"""
+}
+
+TestCurrentBranch: os.#Container & {
+	image: alpine.#Image & {
+		package: bash: true
+		package: git:  true
+	}
+	env: BRANCH_NAME: branch.name
+	command: """
+		[ $BRANCH_NAME = "master" ]
+		"""
+}
+
+TestCurrentTags: os.#Container & {
+	image: alpine.#Image & {
+		package: bash: true
+		package: git:  true
+	}
+	env: TAGS: strings.Join([ for k, v in tagsList.tags {"\(k)=\(v)"}], "\n")
+	command: """
+		[ $TAGS = "0=master" ]
+		"""
+}
+
+// Test fetching a private repo
+TestPAT: dagger.#Input & {dagger.#Secret}
+
+privateRepo: #Repository & {
+	remote:     "https://github.com/dagger/dagger.git"
+	ref:        "main"
+	keepGitDir: true
+	authToken:  TestPAT
+}
+
+TestPrivateRepository: os.#Container & {
+	image: alpine.#Image & {
+		package: bash: true
+		package: git:  true
+	}
+	mount: "/repo1": from: privateRepo
+	dir: "/repo1"
+	command: """
+		[ -d .git ]
+		"""
+}
+
+TestReferenceFormat: os.#Container & {
+	image: alpine.#Image & {
+		package: bash: true
+		package: git:  true
+	}
+	mount: "/repo1": from: privateRepo
+	dir: "/repo1"
+	command: """
+		URL="$(git ls-remote --get-url origin)"
+		[[ "$URL" = "https://github.com/dagger/dagger.git" ]]
+		"""
+}