Update Dockerfile and remove SSL certificate handling

This commit removes the lines about adding an application and handling SSL certificate in the Dockerfile. It also changes the "ADD" instruction to the "COPY" instruction for better build cache use and simplicity.

Dockerfile

@@ -1,10 +1,6 @@
 FROM node:16.18.0
-
-ADD . /app
 WORKDIR /app
-RUN --mount=type=secret,id=certificate \
-          cat /run/secrets/certificate >> /app/ca-certificate.crt
-
+COPY . .
 RUN yarn install && yarn build
 
 CMD ["yarn","start"]