Fix a few warnings about old Dockerfile and Docker Compose syntax (#392)

compose.local.yml

@@ -1,6 +1,5 @@
 # Note for maintainers: When making a change in this file,
 # you're likely to make the same change in simulator/docs/sample/plugin-extender/docker-compose.yaml.
-version: "3.7"
 services:
   # This container copies the data,
   # so any changes made to the configuration files within the Pod will not affect the original files.

simulator/docs/sample/plugin-extender/docker-compose.yaml

@@ -1,4 +1,3 @@
-version: "3.7"
 services:
   extender:
     image: test/test:test   # TODO(user): replace it with your extender's image

web/Dockerfile

@@ -17,13 +17,13 @@ RUN yarn build && yarn install --production --ignore-scripts --prefer-offline
 FROM node:16-alpine AS runner
 WORKDIR /app
 
-ENV NODE_ENV production
-ENV NUXT_TELEMETRY_DISABLED 1
+ENV NODE_ENV=production
+ENV NUXT_TELEMETRY_DISABLED=1
 # Currnently, HOST_ENV is used to decide whether to import the TEMPLATE files of the k8s resources.
 # ./components/lib/templates/*.yaml
-ENV HOST_ENV production
-ENV BASE_URL http://localhost:1212
-ENV KUBE_API_SERVER_URL http://localhost:3131
+ENV HOST_ENV=production
+ENV BASE_URL=http://localhost:1212
+ENV KUBE_API_SERVER_URL=http://localhost:3131
 
 RUN addgroup -g 1001 -S nodejs
 RUN adduser -S nuxtjs -u 1001