diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..0b768cf
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,48 @@
+name: ci
+
+on: pull_request
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: asdf-vm/actions/install@v3
+      with:
+        tool_versions: |
+          action-validator 0.5.1
+    - run: asdf reshim action-validator
+    - run: action-validator ./action.yml
+    - run: action-validator ./.github/workflows/ci.yml
+
+  test:
+    needs: lint
+    runs-on: ubuntu-latest
+    name: test-${{ matrix.env }}
+    strategy:
+      matrix:
+        env:
+        - production
+        - staging
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ./
+      with:
+        config-production: 'foo'
+        config-staging: 'bar'
+        environment: ${{ matrix.env }}
+
+  test_failure:
+    needs: lint
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ./
+      continue-on-error: true
+      id: fail-step
+      with:
+        config-production: 'foo'
+        config-staging: 'bar'
+        environment: stage
+    - if: steps.fail-step.outcome == 'success'
+      run: exit 1
diff --git a/action.yml b/action.yml
index b16816e..2781c62 100644
--- a/action.yml
+++ b/action.yml
@@ -4,11 +4,7 @@ inputs:
   environment:
     required: true
     description: the environment to deploy to
-    type: choice
     default: staging
-    options:
-    - staging
-    - production
   config-production:
     required: true
     description: k8s configuration for production
@@ -21,6 +17,11 @@ inputs:
 runs:
   using: "composite"
   steps:
+  - shell: bash
+    run: |
+      echo "Unknown environment: ${{ inputs.environment }}"
+      exit 1
+    if: (inputs.environment != 'production' && inputs.environment != 'staging')
   - uses: yokawasa/action-setup-kube-tools@v0.9.2
     with:
       kubectl: '1.27.5'