[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

@@ -6,7 +6,7 @@ jobs:
build:
name: "Build"
runs-on: ubuntu-latest
container: wpilib/gazebo-ubuntu:20.04
container: wpilib/gazebo-ubuntu:18.04
steps:
- uses: actions/checkout@v2
with: