Add ability to create environment from lockfile

[nkaretnikov]

Fixes #676.

Description

This pull request:

• adds a way to create an environment from a lockfile
• adds a test.

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

Additional information

• conda-store-ui will need to be extended to support this feature because it has its own YAML parser
• I didn't add documentation for this reason as well. Despite being in this repo, most of our docs are about conda-store-ui. I think it needs to be implemented on the UI side before we document it in user-visible docs, otherwise it'll be confusing.

How to test

Automated testing

• Run the server via docker:

docker compose up --build

• Once the server is running, the following command should succeed:

pytest -rfxs tests/test_api.py::test_create_lockfile_specification_auth -vvv --capture=no

Manual testing

• Submit a specification like the following:

• A whitespace-sensitive version is also accepted:

• Do not forget to click on the checkbox

• The keys are: name, description, and lockfile. conda-store requires that a specification has a name, which is why this wraps an upstream conda-lock lockfile format instead of passing it directly as a specification. From conda-store-server/conda_store_server/schema.py:

class LockfileSpecification(BaseModel):
    name: constr(regex=f"^[{ALLOWED_CHARACTERS}]+$")  # noqa: F722
    description: Optional[str] = ""
    lockfile: Lockfile

• lockfile corresponds to a lockfile that conda-store produces, which is the v1 conda-lock lockfile:

class Lockfile(StrictModel):
    version: ClassVar[int] = 1

    package: List[LockedDependency]
    metadata: LockMeta

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[nkaretnikov]

@jaimergp A gentle reminder that this needs review.

[jaimergp]

I haven't tested this live, but I already have a few comments about the initial implementation. See inlines for more details, but to sum up:

• Use dropdown menu instead of a checkbox
• Don't push data model abstractions to the UI (the user should not need to manipulate their lockfile when copy-pasting). Instead, add extra fields as needed.
• constructor does support explicit.txt lockfiles which can be easily generated from the conda-lock.yml.