diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index c8e6c01..55d9ab4 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,16 +14,16 @@ jobs:
 
       - name: Populate Nix store
         run:
-          nix-shell --run 'true'
+          nix-shell --pure --run 'true'
 
       - name: Type-check with lua-language-server
         run:
-          nix-shell --run 'make lint'
+          nix-shell --pure --run 'make lint'
 
       - name: Check formatting with stylua
         run:
-          nix-shell --run 'make fmt-check'
+          nix-shell --pure --run 'make fmt-check'
 
       - name: Run busted tests
         run:
-          nix-shell --run 'make test'
+          nix-shell --pure --run 'make test'
diff --git a/.woodpecker/ci.yaml b/.woodpecker/ci.yaml
new file mode 100644
index 0000000..8374cb6
--- /dev/null
+++ b/.woodpecker/ci.yaml
@@ -0,0 +1,10 @@
+when:
+  - event: push
+
+steps:
+  - name: build
+    image: nixos/nix
+    commands:
+      - nix-shell --pure --run 'make lint'
+      - nix-shell --pure --run 'make fmt-check'
+      - nix-shell --pure --run 'make test'