Factor out incremental build prep into an action #48

Job	Run time
x86_64-gcc / build-release	0s
x86_64-llvm-17 / build-release	0s
x86_64-gcc / build / build for x86_64 with gcc	24m 5s
x86_64-llvm-17 / build / build for x86_64 with llvm-17	29m 36s
x86_64-gcc / test (test_maps, false, 360) / test_maps on x86_64 with gcc	4m 16s
x86_64-gcc / test (test_progs, false, 360) / test_progs on x86_64 with gcc	6m 44s
x86_64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with gcc	7m 29s
x86_64-gcc / test (test_verifier, false, 360) / test_verifier on x86_64 with gcc	44s
x86_64-llvm-17 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-17	3m 56s
x86_64-llvm-17 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-17	6m 56s
x86_64-llvm-17 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-17	7m 0s
x86_64-llvm-17 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-17	42s
	1h 31m 28s

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