Enable specifying flake policies via Common Expression Language #56

Job	Run time
Check flake.lock test (clean 👼)	1m 31s
Check flake.lock test (dirty 😈 plus fail mode activated)	0s
Check flake.lock test (dirty 😈)	1m 42s
Check flake.lock test (CEL condition)	1m 53s
Nix and Rust checks	1m 27s
Test Rust	1m 47s
Build artifacts / build-artifacts (aarch64-darwin, macos-latest-xlarge, ARM64-macOS)	2m 5s
Build artifacts / build-artifacts (x86_64-darwin, macos-12, X64-macOS)	3m 3s
Build artifacts / build-artifacts (aarch64-linux, namespace-profile-default-arm64, ARM64-Linux)	2m 12s
Build artifacts / build-artifacts (x86_64-linux, ubuntu-22.04, X64-Linux)	1m 16s
Integration test for flake-checker-action (X64-Linux, ubuntu-22.04)	9s
Integration test for flake-checker-action (ARM64-Linux, namespace-profile-default-arm64)	8s
Integration test for flake-checker-action (X64-macOS, macos-12)	10s
Integration test for flake-checker-action (ARM64-macOS, macos-latest-xlarge)	9s
	17m 32s

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