Use pipx for all global python binaries

[mhart]

• Add /root/.local/bin to PATH

• Add pipx to base build images

• Update aws-lambda-builders to 1.0.0

• Update dotnetcore3.1 build SDK to 3.1.302

• Addresses discussion in python3.8 error building on stock Ubuntu-20.24 WSL2 #296

[mhart]

In case this breaks anyone's workflow, all existing build images have been tagged and published as:

lambci/lambda:20200719-build-${RUNTIME}

(eg, lambci/lambda:20200719-build-python3.6)

[jfuss]

@mhart Thanks for doing this. This looks good from what I can tell. I would have just used venv directly but pipx works too. Does pipx put the clis into the path automatically?

[mhart]

Yeah it does – saves a bit of fiddling that would come with manually doing this from venvs

[twasink]

From what I can tell from the docs, if you set the PIPX_BIN_DIR variable as part of doing the various pipx install steps, you could install the binaries into a path that wasn't in the /root/ dir, and thus into a place readable by non-root users - e.g. /usr/local/bin or /opt/bin.

This would avoid the whole "breaking people's workflow" problem.