Updated the docker docs (pkgxdev#884)

* updated the docker docs to account for the fact that ubuntu might not have curl installed sometimes
* removed the sudo command since it will raise a conflict in docker
* Combined curl installation commands
* Combined curl installation commands

docs/run/anywhere/docker.md

@@ -49,6 +49,10 @@ options:
 
 ```Dockerfile
 FROM ubuntu
+
+# Install curl in case it isn't already
+RUN apt update && apt upgrade && apt install curl
+
 RUN eval "$(curl https://pkgx.sh)" && dev && npm start
 ```
 
@@ -61,7 +65,12 @@ use a more advanced shell like bash:
 
 ```Dockerfile
 FROM ubuntu
+
 SHELL ["/bin/bash", "-c"]
+
+# Install curl in case it isn't already
+RUN apt update && apt upgrade && apt install curl
+
 RUN curl https://pkgx.sh | sh
 RUN pkgx integrate
 RUN dev && npm start  # you still have to run `dev && ` tho