docs(whitespace): standardize `CMD` example commands (#17033)

language/golang/build-images.md

@@ -241,7 +241,7 @@ image is used to start a container.
 We do this with the `CMD` command:
 
 ```dockerfile
-CMD [ "/docker-gs-ping" ]
+CMD ["/docker-gs-ping"]
 ```
 
 Here's the complete `Dockerfile`:
@@ -273,7 +273,7 @@ RUN CGO_ENABLED=0 GOOS=linux go build -o /docker-gs-ping
 EXPOSE 8080
 
 # Run
-CMD [ "/docker-gs-ping" ]
+CMD ["/docker-gs-ping"]
 ```
 
 The `Dockerfile` may also contain _comments_. They always begin with a `#` symbol,

language/nodejs/build-images.md

@@ -158,7 +158,7 @@ COPY . .
 The COPY command takes all the files located in the current directory and copies them into the image. Now, all we have to do is to tell Docker what command we want to run when our image is run inside of a container. We do this with the `CMD` command.
 
 ```dockerfile
-CMD [ "node", "server.js" ]
+CMD ["node", "server.js"]
 ```
 
 Here's the complete Dockerfile.
@@ -177,7 +177,7 @@ RUN npm install --production
 
 COPY . .
 
-CMD [ "node", "server.js" ]
+CMD ["node", "server.js"]
 ```
 
 ## Create a .dockerignore file

language/nodejs/run-tests.md

@@ -119,12 +119,12 @@ COPY package-lock.json package-lock.json
 FROM base as test
 RUN npm ci
 COPY . .
-CMD [ "npm", "run", "test" ]
+CMD ["npm", "run", "test"]
 
 FROM base as prod
 RUN npm ci --production
 COPY . .
-CMD [ "node", "server.js" ]
+CMD ["node", "server.js"]
 ```
 
 We first add a label `as base` to the `FROM node:18-alpine` statement. This allows us to refer to this build stage in other build stages. Next we add a new build stage labeled test. We will use this stage for running our tests.
@@ -189,7 +189,7 @@ RUN npm run test
 FROM base as prod
 RUN npm ci --production
 COPY . .
-CMD [ "node", "server.js" ]
+CMD ["node", "server.js"]
 ```
 
 Now to run our tests, we just need to run the docker build command as above.

language/python/build-images.md

@@ -116,7 +116,7 @@ COPY . .
 Now, tell Docker what command to run when the image is executed inside a container using the `CMD` command. Note that you need to make the application externally visible (i.e. from outside the container) by specifying `--host=0.0.0.0`.
 
 ```dockerfile
-CMD [ "python3", "-m" , "flask", "run", "--host=0.0.0.0"]
+CMD ["python3", "-m" , "flask", "run", "--host=0.0.0.0"]
 ```
 
 Here's the complete Dockerfile.
@@ -133,7 +133,7 @@ RUN pip3 install -r requirements.txt
 
 COPY . .
 
-CMD [ "python3", "-m" , "flask", "run", "--host=0.0.0.0"]
+CMD ["python3", "-m" , "flask", "run", "--host=0.0.0.0"]
 ```
 
 ### Directory structure
@@ -170,7 +170,7 @@ $ docker build --tag python-docker .
  => [3/6] COPY requirements.txt requirements.txt
  => [4/6] RUN pip3 install -r requirements.txt
  => [5/6] COPY . .
- => [6/6] CMD [ "python3", "-m", "flask", "run", "--host=0.0.0.0"]
+ => [6/6] CMD ["python3", "-m", "flask", "run", "--host=0.0.0.0"]
  => exporting to image
  => => exporting layers
  => => writing image sha256:8cae92a8fbd6d091ce687b71b31252056944b09760438905b726625831564c4c