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fix: set PKG_CONFIG_PATH for openssl in CI workflow

nixery containers don't automatically set PKG_CONFIG_PATH like nix-shell does.
dynamically find the openssl.dev path in /nix/store and set PKG_CONFIG_PATH
to point to its pkgconfig directory before running cargo commands.

tested locally in nixos/nix docker container with the same dependencies.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Changed files
+2
.tangled
workflows
+2
.tangled/workflows/check.yaml
··· 17 17 steps: 18 18 - name: check formatting 19 19 command: | 20 + export PKG_CONFIG_PATH=$(find /nix/store -maxdepth 1 -name "*openssl*-dev" -type d | head -1)/lib/pkgconfig 20 21 cargo fmt --check 21 22 22 23 - name: run clippy 23 24 command: | 25 + export PKG_CONFIG_PATH=$(find /nix/store -maxdepth 1 -name "*openssl*-dev" -type d | head -1)/lib/pkgconfig 24 26 cargo clippy -- -D warnings