ci: fix GDAL numpy 2.0 ABI mismatch by disabling caching for gdal wheel

[maurerle]

User description

Enabled pip caching in both test and pages workflows for performance, but explicitly added --no-cache-dir to the GDAL pip install. This ensures the GDAL C-extensions are always built fresh against the current numpy and system libgdal-dev, preventing ImportError crashes when numpy upgrades (e.g. to 2.0).

Assisted-by: gemini-3.1-pro-low

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PR Type

Bug fix, Enhancement

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Description

• Add pip caching to test workflow

• Disable GDAL wheel caching in CI

• Prevent numpy/GDAL ABI mismatch crashes

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Diagram Walkthrough

flowchart LR
  A["GitHub Actions workflows"] --> B["Enable pip cache"]
  A["GitHub Actions workflows"] --> C["Install GDAL from system version"]
  C["Install GDAL from system version"] --> D["Use --no-cache-dir for GDAL"]
  D["Use --no-cache-dir for GDAL"] --> E["Avoid numpy ABI mismatch"]

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File Walkthrough

	Relevant files
Bug fix	gh-pages.yml Force uncached GDAL install for Pages                                        .github/workflows/gh-pages.yml Install GDAL with --no-cache-dir Ensure fresh GDAL build against env +1/-1
Enhancement	python-test.yml Cache pip deps, avoid cached GDAL wheels                                  .github/workflows/python-test.yml Enable pip caching via actions/setup-python Configure cache key with **/pyproject.toml Install GDAL with --no-cache-dir +3/-1

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