CI: add Alpine multi-platform CI

[neheb]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (28fa956) 64.57% compared to head (cd963b0) 63.93%.
Report is 2 commits behind head on main.

❗ Current head cd963b0 differs from pull request most recent head 94c4ce7. Consider uploading reports for the commit 94c4ce7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2894      +/-   ##
==========================================
- Coverage   64.57%   63.93%   -0.64%     
==========================================
  Files         104      104              
  Lines       22196    22400     +204     
  Branches    10882    10877       -5     
==========================================
- Hits        14332    14322      -10     
- Misses       5622     5854     +232     
+ Partials     2242     2224      -18     

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[neheb]

hrm no new failures. Maybe some will pop up if I apply this to the CMake tests.

[neheb]

I hate conan.

[neheb]

2024-01-19T03:18:41.1850664Z FAIL: test_run (github.test_CVE_2018_12265.AdditionOverflowInLoaderExifJpeg.test_run)
2024-01-19T03:18:41.1851309Z ----------------------------------------------------------------------
2024-01-19T03:18:41.1851701Z Traceback (most recent call last):
2024-01-19T03:18:41.1852232Z   File "/home/runner/work/exiv2/exiv2/tests/system_tests.py", line 652, in test_run
2024-01-19T03:18:41.1852852Z     self.compare_stderr(i, command, processed_stderr, stderr)
2024-01-19T03:18:41.1853490Z   File "/home/runner/work/exiv2/exiv2/tests/system_tests.py", line 773, in compare_stderr
2024-01-19T03:18:41.1854039Z     self._compare_output(
2024-01-19T03:18:41.1854539Z   File "/home/runner/work/exiv2/exiv2/tests/system_tests.py", line 745, in _compare_output
2024-01-19T03:18:41.1855098Z     self.assertMultiLineEqual(
2024-01-19T03:18:41.1855909Z AssertionError: 'Erro[319 chars]ata area; ignored.\n' != 'Erro[319 chars]ata area; ignored.\nUncaught exception: Overflow in addition\n'
2024-01-19T03:18:41.1857144Z   Error: Upper boundary of data for directory Image, entry 0x00fe is out of bounds: Offset = 0x0000002a, size = 64, exceeds buffer size by 22 Bytes; truncating the entry
2024-01-19T03:18:41.1858173Z   Warning: Directory Image, entry 0x0201: Strip 0 is outside of the data area; ignored.
2024-01-19T03:18:41.1858879Z   Warning: Directory Image, entry 0x0201: Strip 7 is outside of the data area; ignored.
2024-01-19T03:18:41.1859431Z + Uncaught exception: Overflow in addition
2024-01-19T03:18:41.1859784Z  : Standard error does not match

ping @kevinbackhouse

[neheb]

nvm, that's probably a bug.