[GitHub] [trafficcontrol] dangogh opened a new pull request #3916: [Issue-3915] Use LTS version of ubuntu image for dns container

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dangogh opened a new pull request #3916: [Issue-3915] Use LTS version of ubuntu image for dns container
URL: https://github.com/apache/trafficcontrol/pull/3916
 
 
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   ## What does this PR (Pull Request) do?
   Sets version used in dns Dockerfile to LTS version.
   
   - [x] This PR fixes #3915 
   
   ## Which Traffic Control components are affected by this PR?
   - CDN in a Box
   
   ## What is the best way to verify this PR?
   
   ```
   cd infrastructure/cdn-in-a-box
   docker-compose build dns   # just to test that it builds
   docker-compose up --build  # to test that the whole thing comes up
   ```
   
   ## If this is a bug fix, what versions of Traffic Control are affected?
   - master (c99b0fb3bff309f61166b335309917413cf46e5e)
   
   Only fixes downloaded version.  Test is build and run cdn-in-a-box.  No doc changes or CHANGELOG needed.  No new files, so no license headers.
   
   ## The following criteria are ALL met by this PR
   - [x] This PR includes tests OR I have explained why tests are unnecessary
   - [x] This PR includes documentation OR I have explained why documentation is unnecessary
   - [x] This PR includes an update to CHANGELOG.md OR such an update is not necessary
   - [x] This PR includes any and all required license headers
   - [x] This PR ensures that database migration sequence is correct OR this PR does not include a database migration
   - [x] This PR **DOES NOT FIX A SERIOUS SECURITY VULNERABILITY** (see [the Apache Software Foundation's security guidelines](https://www.apache.org/security/) for details)
   
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