feat: write auto-detected port mappings during a deploy

During an app build, we now auto-detect ports based on the source code. This is usually http:80:5000, with Dockerfile-based deploys having their ports extracted from the docker image or Dockerfile. Additionally, we add an https:443 mapping for any detected http:80 mapping when there is an ssl certificate, and all http port mappings are transformed to https mappings for Dockerfile-based deploys.

While the ports aren't currently consumed, a future refactor will provide the ability to fallback to the new detected ports when there is no user-specified port mapping.

docs/networking/port-management.md

@@ -212,11 +212,14 @@ dokku ports:report
 
 ```
 =====> node-js-app ports information
-       Port map:      http:80:5000 https:443:5000
+       Port map detected: http:80:5000
+       Port map:          http:80:5000 https:443:5000
 =====> python-sample ports information
-       Port map:      http:80:5000
+       Port map detected: http:80:5000
+       Port map:          http:80:5000
 =====> ruby-sample ports information
-       Port map:      http:80:5000
+       Port map detected: http:80:5000
+       Port map:          http:80:5000
 ```
 
 You can run the command for a specific app also.
@@ -227,7 +230,8 @@ dokku ports:report node-js-app
 
 ```
 =====> node-js-app ports information
-       Port map:      http:80:5000 https:443:5000
+       Port map detected: http:80:5000
+       Port map:          http:80:5000 https:443:5000
 ```
 
 You can pass flags which will output only the value of the specific information you want. For example: