MOBILE-3496 Docker: Add docker files in ionic 5 branch

.dockerignore

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+node_modules
+Dockerfile

Dockerfile

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+# This image is based on the fat node 14 image.
+# We require fat images as neither alpine, or slim, include git binaries.
+FROM node:14
+
+# Port 8100 for ionic dev server.
+EXPOSE 8100
+
+# Port 35729 is the live-reload server.
+EXPOSE 35729
+
+# Port 53703 is the Chrome dev logger port.
+EXPOSE 53703
+
+WORKDIR /app
+
+COPY . /app
+
+# Install npm libraries.
+RUN npm install && rm -rf /root/.npm
+
+# Run gulp before starting.
+RUN npx gulp
+
+# Provide a Healthcheck command for easier use in CI.
+HEALTHCHECK --interval=10s --timeout=3s --start-period=30s CMD curl -f http://localhost:8100 || exit 1
+
+CMD ["npm", "run", "ionic:serve"]