add various cargo ci checks

.woodpecker/cargo_check.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: "Run cargo check"
+    image: docker.nix-community.org/nixpkgs/nix-flakes
+    commands:
+      - nix run github:nixos/nixpkgs/nixos-unstable#cargo -- check --workspace --all-targets

.woodpecker/cargo_clippy.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: "Run cargo clippy"
+    image: docker.nix-community.org/nixpkgs/nix-flakes
+    commands:
+      - nix run github:nixos/nixpkgs/nixos-unstable#clippy

.woodpecker/cargo_test.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: "Run cargo test"
+    image: docker.nix-community.org/nixpkgs/nix-flakes
+    commands:
+      - nix run github:nixos/nixpkgs/nixos-unstable#cargo -- test --workspace --all-targets

.woodpecker/check_fmt.yaml

@@ -2,7 +2,7 @@ when:
   - event: pull_request
 
 steps:
-  - name: "Run nix flake check"
+  - name: "Run treefmt"
     image: docker.nix-community.org/nixpkgs/nix-flakes
     commands:
       - nix fmt -- --fail-on-change