Update builder image to ubuntu-20.04 #84
Merged
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GitHub has deprecated the ubuntu-18.04 builder image. So before that builder image is entirely removed, this PR updates the build process to use the ubuntu-20.04 image instead.
This commit also installs an older version of GCC (v7) because binutils-esp32ulp does not build successfully on Ubuntu 20.04 with its default GCC version (v9). (Solution was found here: espressif/binutils-esp32ulp#19 (comment))
Fixes: #80
PS: Ubuntu 22.04 no longer has GCC v7 in its repository, which is why this PR only changes to Ubuntu 20.04 for now (should last a while). It appears binutils-esp32ulp has some bigger change in the making (see this comment), which might make it compatible with a newer GCC in the near future, and then perhaps easier for us to update to Ubuntu 22.04.