ci: persist ccache across ephemeral runner pods via actions/cache #17223

Job	Run time
Build without ELPA	8m 15s
Build without MPI	6m 3s
Build without LCAO and MPI	4m 12s
Build with GNU toolchain	8m 20s
Build without LCAO	4m 54s
Build extra components with GNU toolchain	17m 6s
Build with Intel toolchain	8m 16s
Build extra components with Intel toolchain	18m 10s
Build with CUDA support	12m 30s
	1h 27m 46s

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