dangernoodle-io / TaipanMiner / 25613691121

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ci: wire ccache via CMake launcher + PATH masquerade (#353)

PR #352's IDF_CCACHE_ENABLE didn't take effect because PIO uses its
own SCons wrapper around ESP-IDF and doesn't honor that flag. The
ccache stats step on the next build showed 0/5 GiB used.

Switch to CMake's documented launcher mechanism: setting
CMAKE_C_COMPILER_LAUNCHER=ccache and CMAKE_CXX_COMPILER_LAUNCHER=ccache
as job-level env makes CMake prepend ccache to every compile
invocation regardless of toolchain path.

As belt-and-suspenders, also create /usr/lib/ccache symlinks for the
xtensa-esp32s3 and riscv32-esp toolchains and prepend that dir to
PATH so any non-CMake invocations get caught by the masquerade
mechanism.

Initialize CCACHE_DIR explicitly so the cache dir exists before the
cache-save step runs (eliminates the 'Path Validation Error' warning).
Use absolute path /home/runner/.cache/ccache for the cache action's
path input since GHA cache plugin doesn't expand ~.

ccache stats step uses -s -v for per-phase breakdown.

848 of 2300 branches covered (36.87%)

Branch coverage included in aggregate %.

1817 of 3591 relevant lines covered (50.6%)

229923.72 hits per line