[CT-209] [Bug] Error parsing env vars in on-run-start or on-run-end hooks

[fbertsch]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

If the on-run-start or on-run-end hook contains jinja that calls the env_var function, the compilation will fail with an error like the following:

 Encountered an error:
'$PROJECT://./dbt_project.yml'

Expected Behavior

I would expect the compilation to succeed when using the env_var function.

Steps To Reproduce

1. Add an environment variable: export TEST_ENV_VAR="true"
2. Add that env var to the on-run-start as a jinja function call:

on-run-start:
  - "{{ env_var('TEST_ENV_VAR') }}"

3. Run dbt compile

Relevant log output

19:42:41.432145 [debug] [MainThread]: Flushing usage events
19:42:41.432955 [error] [MainThread]: Encountered an error:
'bug_test://./dbt_project.yml'
19:42:41.439341 [debug] [MainThread]: Traceback (most recent call last):
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/main.py", line 127, in main
    results, succeeded = handle_and_check(args)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/main.py", line 192, in handle_and_check
    task, res = run_from_args(parsed)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/main.py", line 246, in run_from_args
    results = task.run()
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/task/runnable.py", line 454, in run
    self._runtime_initialize()
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/task/runnable.py", line 156, in _runtime_initialize
    super()._runtime_initialize()
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/task/runnable.py", line 94, in _runtime_initialize
    self.load_manifest()
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/task/runnable.py", line 81, in load_manifest
    self.manifest = ManifestLoader.get_full_manifest(self.config)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/parser/manifest.py", line 200, in get_full_manifest
    manifest = loader.load()
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/parser/manifest.py", line 326, in load
    parser_types
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/parser/manifest.py", line 482, in parse_project
    hook_parser.parse_file(file_block)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/parser/hooks.py", line 119, in parse_file
    self.parse_node(hook)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/parser/base.py", line 402, in parse_node
    self.render_update(node, config)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/parser/base.py", line 377, in render_update
    context = self.render_with_context(node, config)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/parser/base.py", line 268, in render_with_context
    parsed_node.raw_sql, context, parsed_node, capture_macros=True
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/clients/jinja.py", line 600, in get_rendered
    return render_template(template, ctx, node)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/clients/jinja.py", line 549, in render_template
    return template.render(ctx)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/jinja2/environment.py", line 1090, in render
    self.environment.handle_exception()
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/jinja2/environment.py", line 832, in handle_exception
    reraise(*rewrite_traceback_stack(source=source))
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/jinja2/_compat.py", line 28, in reraise
    raise value.with_traceback(tb)
  File "<template>", line 1, in top-level template code
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/jinja2/sandbox.py", line 462, in call
    return __context.call(__obj, *args, **kwargs)
  File "/Users/frankbertsch/repos/all-the-things/deployable/dbt/src/.venv37/lib/python3.7/site-packages/dbt/context/providers.py", line 1192, in env_var
    source_file = self.manifest.files[self.model.file_id]
KeyError: 'bug_test://./dbt_project.yml'

### Environment

```markdown
- OS: MacOS 11.5.2
- Python: Tested on 3.7.5 and 3.7.8
- dbt: 1.0.0

What database are you using dbt with?

snowflake

Additional Context

No response

[fbertsch]

Fixed with #4524 - sorry for the noise! Upgrading to 1.0.1