Updated install docs (sed) to accept keys with `/` in them

[levb]

Description

Escaped the /s in the public key (sed command parameter)

Motivation and Context

I encountered an issue installing faasd, my key had multiple /s in it.

How Has This Been Tested?

My installation worked with the change

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

Commits:

• [X] I've read the CONTRIBUTION guide
• [X] My commit message has a body and describe how this was tested and why it is required.
• [X] I have signed-off my commits with git commit -s for the Developer Certificate of Origin (DCO)

Code:

• [ ] My code follows the code style of this project.
• [ ] I have added tests to cover my changes.

Docs:

• [ ] My change requires a change to the documentation.
• [X] I have updated the documentation accordingly.

[derek[bot]]

Thank you for your contribution. It seems that one or more of your commits have a "Signed-off-by" statement with an anonymous email address. The Developer Certificate of Origin (DCO) requires all commits to be signed off by genuine, contactable individuals. Please see our contributing guide.

### :bulb: Shall we fix this?

This will only take a few moments.

First, clone your fork and checkout this branch using the git CLI.

Next, set up your real name and email address:

git config --global user.name "Your Full Name" git config --global user.email "[email protected]"

Finally, run one of these commands to add the "Signed-off-by" line to your commits.

If you only have one commit so far then run: git commit --amend --signoff and then git push --force. If you have multiple commits, watch this video.

Check that the message has been added properly by running "git log".

[alexellis]

Hey @levb, Hope you're well.

Are you looking to use faasd within Mattermost? I believe we've had discussions with various folks in your org in the past about sponsorships and potential commercials etc.

Alex