Add bash installation script for macos or linux users.

[cmoulliard]

• Add bash installation script for macos or linux users.
• download . latest version of the project or specific version, untar it and move project under /usr/local/bin/kubebuilder
• Fix [Feature] Bash install script #482

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: cmoulliard
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[droot]

@cmoulliard Its blocked on CLA.

[cmoulliard]

I tried many times to get an email's validation from "linuxfoundation" to create an account for the ICLA since yesterday without success.

[hidekazuna]

This line has changed to the following line in #470.
mv kubebuilder_${version}darwin${arch} kubebuilder && sudo mv kubebuilder /usr/local/

[cmoulliard]

If /usr/local/kubebuilder folder already exists, then we can't use mv kubebuilder /usr/local directly but a sudo rm -rf /usr/local/kubebuilder will be first needed. Instead of doing that, we could also rsync folders -> rsync -avh ./kubebuilder/ /usr/local/kubebuilder ? WDYT @hidekazuna ?

[hidekazuna]

If /usr/local/kubebuilder directory already exists, it is better to warn it and stop executing than force installing.
If force Installing, kubebuilder may be upgraded or downgraded unintentionally.

[cmoulliard]

I agree with you. We will then exit in this case and add a warning message to the user that prior to upgrade, in this case, they have to first delete the existing folder or backup it.

[cmoulliard]

As my PR contains 2 non needed commits, I will close this one submit a new PR if you agree including also the modifications requested for the bash script -> https://github.com/cmoulliard/kubebuilder/commit/b85612e657c9ab0b56506b085a0e1c89dc76f0ec
@hidekazuna

[cmoulliard]

New PR will be submitted