Update build metadata on deletion, fix misc bugs

[nkaretnikov]

Fixes #560.

[netlify]

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[nkaretnikov]

Bug fix: PosixPath object (conda_prefix) has no attribute startswith, so need to convert to str first

[nkaretnikov]

Bug fix: CondaStore object has no attribute db, need to just use db for this

[nkaretnikov]

Metadata fix: size value of the current build is shown in the web UI as size. Need to update that when deleting artifacts here.

How it works in more detail:

{% for environment in environments %}
<div class="card my-2">
    <div class="card-body">
        <h5 class="card-title">
            <a href="{{ url_for('ui_get_environment', namespace=environment.namespace.name, environment_name=environment.name) }}">{{ environment.namespace.name }} / <span class="badge badge-info">{{ environment.name }}</span></a>
            <span class="badge badge-light">{{ (environment.current_build.size or 0) | filesizeformat(true) }}</span>
        </h5>

=>

 document.querySelectorAll('button[data-action="delete"]').forEach(item => {
     item.addEventListener('click', (event) => deleteBuild(event));
 })

=>

 async function deleteBuild(event) {
...
     let url = `{{ url_for('api_list_builds') }}${ buildId }/`;
     let response = await fetch(url, { method: 'DELETE' });
...

=>

@router_api.delete(
    "/build/{build_id}/",
    response_model=schema.APIAckResponse,
)
async def api_delete_build(
...
        conda_store.delete_build(db, build_id)

=>

     def delete_build(self, db: Session, build_id: int):
...
        tasks.task_delete_build.si(build.id).apply_async()

=>

task_delete_build (this function)

[nkaretnikov]

To test that this works:

• Remove all DB state files from before if you have any
• Log in
• Create this env via http://localhost:5000/admin/create/:

channels:
- conda-forge
dependencies:
- rust>=1.71.1
- binutils-meta>=1.0.4
- gcc>=12.2.0
- llvm-meta>=13.0.1
- cudatoolkit-dev>=11.4.0
description: slow env
name: slow
prefix: null
variables: null

• Go to http://localhost:5000/admin/environment/default/slow/ and wait for the build to complete (takes around 5 mins)
• Once complete, see if the size on the same page has updated. For me, it shows default/slow 7.3 GiB
• Delete Build 1 (this build) by clicking on the Trash Bin icon on the same page
• Web UI should immediately update to default/slow 0 Bytes
• Click on the Rebuild icon on the same page to build this env again
• Wait 5 mins or so for Build 2 to complete
• Once done, the Web UI should show default/slow 7.3 GiB again.

[pierrotsmnrd]

Tested locally, and code reviewed : It works, with PR 574 being merged. So merge 574 before merging this one.