diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
new file mode 100644
index 0000000000..8aca8a494f
--- /dev/null
+++ b/.github/workflows/cd.yml
@@ -0,0 +1,35 @@
+name: cd
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25.1"
+
+      - name: Build production binary
+        run: ./scripts/buildprod.sh
+
+      # 🔐 GCP-Login mit deinem Secret
+      - name: Set up gcloud
+        uses: google-github-actions/setup-gcloud@v2
+        with:
+          project_id: notely-476707
+          service_account_key: ${{ secrets.GCP_CREDENTIALS }}
+          export_default_credentials: true
+
+      # 🐳 Image in Artifact Registry bauen & pushen
+      - name: Build and push to Artifact Registry
+        run: |
+          gcloud builds submit \
+            --tag us-central1-docker.pkg.dev/notely-476707/notely-ar-repo/notely:latest .
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000000..d03c23bcc7
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,43 @@
+name: ci
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25.1"
+      - name: Run unit tests
+        run: go test -cover ./...
+      - name: Install gosec
+        run: go install github.com/securego/gosec/v2/cmd/gosec@latest
+      - name: Run gosec security scan
+        run: $(go env GOPATH)/bin/gosec ./...
+
+  style:
+    name: Style
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25.1"
+      - name: Check formatting (fail if changes needed)
+        shell: bash
+        run: test -z "$(go fmt ./...)"
+      - name: Install staticcheck
+        run: go install honnef.co/go/tools/cmd/staticcheck@latest
+      - name: Run staticcheck
+        run: $(go env GOPATH)/bin/staticcheck ./...
diff --git a/README.md b/README.md
index c2bec0368b..741651b75b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+![CI Tests](https://github.com/JanP-K/learn-cicd-starter/actions/workflows/ci.yml/badge.svg)
+
 # learn-cicd-starter (Notely)
 
 This repo contains the starter code for the "Notely" application for the "Learn CICD" course on [Boot.dev](https://boot.dev).
@@ -21,3 +23,5 @@ go build -o notely && ./notely
 *This starts the server in non-database mode.* It will serve a simple webpage at `http://localhost:8080`.
 
 You do *not* need to set up a database or any interactivity on the webpage yet. Instructions for that will come later in the course!
+
+"Jan's version of Boot.dev's Notely app." 
diff --git a/internal/auth/auth_test.go b/internal/auth/auth_test.go
new file mode 100644
index 0000000000..64b5337166
--- /dev/null
+++ b/internal/auth/auth_test.go
@@ -0,0 +1,37 @@
+package auth
+
+import (
+	"net/http"
+	"testing"
+)
+
+func TestGetAPIKey_Success(t *testing.T) {
+	h := http.Header{}
+	h.Set("Authorization", "ApiKey 12345")
+
+	key, err := GetAPIKey(h)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if key != "12345" {
+		t.Errorf("expected 12345, got %q", key)
+	}
+}
+
+func TestGetAPIKey_MissingHeader(t *testing.T) {
+	h := http.Header{}
+	_, err := GetAPIKey(h)
+	if err == nil {
+		t.Fatalf("expected error for missing Authorization header")
+	}
+}
+
+func TestGetAPIKey_WrongScheme(t *testing.T) {
+	h := http.Header{}
+	h.Set("Authorization", "Bearer 12345")
+
+	_, err := GetAPIKey(h)
+	if err == nil {
+		t.Fatalf("expected error for wrong scheme")
+	}
+}
diff --git a/json.go b/json.go
index 1e6e7985e1..a0f282e06b 100644
--- a/json.go
+++ b/json.go
@@ -30,5 +30,7 @@ func respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {
 		return
 	}
 	w.WriteHeader(code)
-	w.Write(dat)
+	if _, err := w.Write(dat); err != nil {
+		log.Printf("write error: %v", err)
+	}
 }
diff --git a/main.go b/main.go
index 19d7366c5f..15ee531c5d 100644
--- a/main.go
+++ b/main.go
@@ -7,6 +7,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"time"
 
 	"github.com/go-chi/chi"
 	"github.com/go-chi/cors"
@@ -89,8 +90,9 @@ func main() {
 
 	router.Mount("/v1", v1Router)
 	srv := &http.Server{
-		Addr:    ":" + port,
-		Handler: router,
+		Addr:              ":" + port,
+		Handler:           router,
+		ReadHeaderTimeout: 5 * time.Second,
 	}
 
 	log.Printf("Serving on port: %s\n", port)