Add environment info

[hmpf]

Scope and purpose

Should probably be merged after #1927, #1929.

Adds the django string setting "ENVIRONMENT" and makes it available to logs. via a log filter -or- a log formatter.

"ENVIRONMENT" is be default set to "environment-unset".

If set to "blbl" and made visible in a log format string, e.g. via:

{
    "formatters": {
        "environment": {
            "()": "argus.logging.formatters.EnvironmentFormatter",
            "format": "{environment} {levelname} {message}",
            "style": "{",
        },
}

then every single log message will start with "blbl ":

LOG.debug("foo")` -> "blbl DEBUG foo"

unless "environment" is passed in via the extra-parameter:

LOG.debug("foo", extra={"environment": "blapp"})` -> "blapp DEBUG foo"

Contributor Checklist

Every pull request should have this checklist filled out, no matter how small it is.
More information about contributing to Argus can be found in the
Development docs.

• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation, including updates to the user manual if feature flow or UI is considerably changed
• Linted/formatted the code with ruff and djLint, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See our how-to
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done
• If this results in changes in the UI: Added screenshots of the before and after
• If this results in changes to the database model: Updated the ER diagram

[github-actions]

Test results

    8 files  1 712 suites   3m 8s ⏱️
  933 tests   932 ✅ 1 💤 0 ❌
7 464 runs  7 456 ✅ 8 💤 0 ❌

Results for commit 6a8a177.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.22%. Comparing base (7c04efb) to head (6a8a177).

Files with missing lines	Patch %	Lines
src/argus/logging/formatters.py	0.00%	20 Missing ⚠️
src/argus/logging/filters.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1928      +/-   ##
==========================================
- Coverage   88.60%   88.22%   -0.39%     
==========================================
  Files         146      148       +2     
  Lines        7093     7124      +31     
==========================================
  Hits         6285     6285              
- Misses        808      839      +31     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud