Reduce image size by cleaning cache

[yhaliaw]

Overview

Reduce the runner image size built by clearing the cache of apt and npm.

Rationale

The image size impacts the remaining free disk space for GitHub Actions job to run on within the runner VM.

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Test coverage for 7e62c67

Name                         Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------
src/charm.py                   458    110    117     26    74%   86-88, 112-113, 117-119, 157-159, 169->181, 179, 214-233, 242-243, 257-259, 260->272, 263->272, 296-300, 331, 411-416, 439, 456-457, 466-489, 509-514, 520-523, 530, 533-534, 550, 554-559, 604->607, 620-621, 623-624, 658-665, 689-690, 702-704, 719-720, 748-749, 751-752, 754-755, 829->831, 892-893, 909, 927-929, 933-934, 938
src/charm_state.py             135     18     18      3    85%   131-138, 220-221, 260-262, 273-274, 280-285, 296-298
src/errors.py                   39      0      0      0   100%
src/event_timer.py              45      9      6      1    73%   80, 100-103, 123-126
src/firewall.py                 43     25     10      0    38%   38-42, 64-67, 75-149
src/github_client.py            68      6     32      3    87%   124, 146, 158-165, 183->216
src/github_metrics.py           14      0      0      0   100%
src/github_type.py              50      0      0      0   100%
src/lxd_type.py                 37      0      2      0   100%
src/metrics.py                  73      2     10      1    96%   61->64, 170-171
src/metrics_type.py              6      0      0      0   100%
src/runner.py                  320     70     96     24    73%   44->46, 125, 252-253, 294-303, 327-332, 337, 357, 361-371, 420->423, 426-428, 435, 449, 459, 463, 465, 480, 506-511, 527-540, 551-590, 595, 633, 680-682, 686, 704, 739, 765, 770-782, 796, 801->803, 806-808
src/runner_logs.py              35      2      6      1    93%   62->61, 66-67
src/runner_manager.py          274     47     90      8    82%   122, 167-169, 182-183, 195-197, 203-208, 212-213, 223-224, 243, 286-287, 331-333, 398, 418-422, 447, 499-502, 538, 645-658, 668, 673-684
src/runner_manager_type.py      33      0      6      0   100%
src/runner_metrics.py          123      8     20      2    93%   147-148, 160, 191-192, 307-311
src/runner_type.py              47      0     10      0   100%
src/shared_fs.py               116     16     20      0    88%   108-109, 133-134, 217-218, 241-242, 254-255, 260-261, 267-268, 292-293
src/utilities.py                68      5     20      7    86%   74->76, 78->84, 91, 121, 135, 173, 226
------------------------------------------------------------------------
TOTAL                         1984    318    463     76    81%

Static code analysis report

Run started:2024-01-17 11:03:32.805730

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4328
  Total lines skipped (#nosec): 0
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 12

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):