Enable specifying flake policies via Common Expression Language #74

Job	Run time
Check flake.lock test (clean 👼)	1m 44s
Check flake.lock test (dirty 😈)	1m 26s
Check flake.lock test (CEL condition)	1m 33s
Check flake.lock test (dirty 😈 plus fail mode activated)	0s
Nix and Rust checks	1m 43s
Test Rust	1m 27s
Build artifacts / build-artifacts (aarch64-darwin, macos-latest-xlarge, ARM64-macOS)	6m 36s
Build artifacts / build-artifacts (x86_64-darwin, macos-12, X64-macOS)	9m 57s
Build artifacts / build-artifacts (aarch64-linux, namespace-profile-default-arm64, ARM64-Linux)	4m 12s
Build artifacts / build-artifacts (x86_64-linux, ubuntu-22.04, X64-Linux)	5m 21s
Integration test for flake-checker-action (X64-Linux, ubuntu-22.04)	15s
Integration test for flake-checker-action (ARM64-Linux, namespace-profile-default-arm64)	8s
Integration test for flake-checker-action (X64-macOS, macos-12)	11s
Integration test for flake-checker-action (ARM64-macOS, macos-latest-xlarge)	9s
	34m 42s

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