Add support for HCaptcha site key during frontend build

frontend/.gitlab-ci.yml

@@ -19,5 +19,6 @@ docker_frontend:
     IMAGE_NAME: frontend
     WORKDIR_PATH: frontend
     DOCKERFILE_PATH: Dockerfile
+    BUILD_ARGS: "--build-arg HCAPTCHA_SITE_KEY=$HCAPTCHA_SITE_KEY"
   needs:
     - build_frontend

frontend/Dockerfile

@@ -14,6 +14,7 @@ RUN npm ci
 COPY . .
 
 # Set it as an environment variable for the build process
+ARG HCAPTCHA_SITE_KEY
 ENV NEXT_PUBLIC_HCAPTCHA_SITE_KEY=${HCAPTCHA_SITE_KEY}
 
 # Build the Next.js app