[build] Change CI back to 18.04 docker images (#3456)

This reverts commit d068fb321f (#3420).

The 18.04 docker images now use GCC 8, which was the original reason for
updating.  20.04 uses a much more recent libc, so staying with 18.04
enables more Linux platforms to use the binaries.
This commit is contained in:
Peter Johnson
2021-06-20 23:03:29 -07:00
committed by GitHub
parent 57a160f1b3
commit b45572167d
3 changed files with 6 additions and 6 deletions

View File

@@ -10,7 +10,7 @@ jobs:
include:
- os: ubuntu-latest
name: Linux
container: wpilib/roborio-cross-ubuntu:2021-20.04
container: wpilib/roborio-cross-ubuntu:2021-18.04
flags: ""
- os: macos-latest
name: macOS