Enable specifying flake policies via Common Expression Language #71

Job	Run time
Check flake.lock test (clean 👼)	1m 20s
Check flake.lock test (CEL condition)	1m 18s
Check flake.lock test (dirty 😈)	1m 38s
Check flake.lock test (dirty 😈 plus fail mode activated)	0s
Nix and Rust checks	1m 31s
Test Rust	2m 35s
Build artifacts / build-artifacts (aarch64-darwin, macos-latest-xlarge, ARM64-macOS)	1m 35s
Build artifacts / build-artifacts (x86_64-darwin, macos-12, X64-macOS)	2m 30s
Build artifacts / build-artifacts (aarch64-linux, namespace-profile-default-arm64, ARM64-Linux)	1m 26s
Build artifacts / build-artifacts (x86_64-linux, ubuntu-22.04, X64-Linux)	41s
Integration test for flake-checker-action (X64-Linux, ubuntu-22.04)	12s
Integration test for flake-checker-action (ARM64-Linux, namespace-profile-default-arm64)	4s
Integration test for flake-checker-action (X64-macOS, macos-12)	11s
Integration test for flake-checker-action (ARM64-macOS, macos-latest-xlarge)	10s
	15m 11s

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