Docker build

.gitlab-ci.yml

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+build:
+  stage: build
+  only:
+    - master
+  image:
+    name: gcr.io/kaniko-project/executor:debug
+    entrypoint: [""]
+  script:
+    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
+    - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG

Dockerfile

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+from node:13 as builder
+workdir /app
+copy . /app
+run npm install .
+run npm run build
+
+from nginx:latest
+copy --from=builder /app/build /usr/share/nginx/html
+copy ./nginx.conf /etc/nginx/conf.d/default.conf
+expose 80

nginx.conf

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+server {
+    listen       80;
+    server_name  localhost;
+
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+    }
+
+    error_page  404              /404.html;
+
+    # redirect server error pages to the static page /50x.html
+    #
+    error_page   500 502 503 504  /50x.html;
+    location = /50x.html {
+        root   /usr/share/nginx/html;
+    }
+}