Add Woodpecker CI provider plugin + fix clippy errors

- Add plugins/provider-woodpecker/ with full Woodpecker CI support
  - Converts CIGen jobs to Woodpecker steps format
  - Maps GitHub Actions to equivalent Woodpecker plugins
  - Handles package caching (Rust/Node) via meltwater/drone-cache
  - Converts condition syntax from GitHub to Woodpecker

- Fix clippy cmp_owned errors in src/commands/generate.rs
  - Use as_os_str() comparison instead of creating PathBuf for comparison

All tests pass, clippy clean, formatted.

Author: ndb-ai-assistants

Cargo.lock

@@ -3,6 +3,7 @@ members = [
     ".",
     "plugins/provider-github",
     "plugins/provider-circleci",
+    "plugins/provider-woodpecker",
 ]
 resolver = "2"
 

Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "cigen-provider-woodpecker"
+version = "0.1.0"
+edition = "2024"
+authors = ["Nathan Broadbent / DocSpring Inc"]
+description = "Woodpecker CI provider plugin for CIGen"
+license = "MIT"
+
+[[bin]]
+name = "cigen-provider-woodpecker"
+path = "src/main.rs"
+
+[dependencies]
+cigen = { path = "../.." }
+anyhow = { workspace = true }
+tokio = { workspace = true }
+tonic = { workspace = true }
+prost = { workspace = true }
+tonic-prost = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
+serde = { workspace = true }
+serde_json = { workspace = true }
+serde_yaml = "0.9.34"