Standardize handling of directories and paths in ci_steps.yml #2066
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Rather than explicitly stating each step's working directory, use use BUILD_DIR and INSTALL_DIR env vars. It's easier to follow this way.
Also, Windows requires explicitly setting the PATH before running ctest and before executing the website example. Set OPENEXR_PATH to have the necessary components. Because the PATH can get modified internally by GitHub actions, it's easiest to gather the path setting into a variable and set it explicitly just before execution.
This also renames the "ubuntu" install manifests to "linux".
This also adds a check to the step that builds the website example to validate that exrinfo produces the expected results.
Website preview: https://openexr--2066.org.readthedocs.build/en/2066/