Update README.md

[shashigokhale]

When I was trying to setup clairctl with docker-compose option as mentioned in the document, I faced some problems. I am proposing these changes as per steps I did to overcome the problems:

When I executed the command “git clone git@github.com:jgsqware/clairctl.git $GOPATH/src/github.com/jgsqware/clairctl” it failed with error message

[root@clair-server ~]# git clone git@github.com:jgsqware/clairctl.git $GOPATH/src/github.com/jgsqware/clairctl
Cloning into '/src/github.com/jgsqware/clairctl'...
The authenticity of host 'github.com (192.30.253.113)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
RSA key fingerprint is MD5:16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,192.30.253.113' (RSA) to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.
[root@clair-server ~]#

So did the following to workaround the problem. If this is a generic issue which could affect many, it would be good to update the project’s README.md with the workaround so that it helps other users of clairctl.

git clone git clone https://github.com/jgsqware/clairctl.git
export GOPATH=$PATH:~/go
mkdir -p $GOPATH/src/github.com/jgsqware/clairctl
mv clairctl $GOPATH/src/github.com/jgsqware/

Then executed the commands below which passed:

cd $GOPATH/src/github.com/jgsqware/clairctl
docker-compose up -d postgres

Then executed the command “docker-compose exec clairctl clairctl health” which failed with error. I Googled about this error, examined the file docker-compose.yml. Based on it, I executed “docker-compose up -d clairctl” which is not mentioned. This is when images for clair and clairctl were downloaded and started. Then I ran “docker-compose exec clairctl clairctl health” which was successful. It would be good to add the missing command: “docker-compose up -d clairctl” to the documentation so that it helps other users of clairctl.

[shashigokhale]

Sorry for the bad formatting in comments for the pull request as I could not figure out how to fix it.