Start CI, fixing an error on Ruby 2.5.

[junaruga]

No change for Gemfile.lock.

• Update a template file for Ruby 2.5.0 ERB syntax.
• Add Travis CI.

According to latest revert [1] by an error on openshift/origin [2], the reason looks related to new version of mysql2 and activerecord.

So, let's do a baby step.

Ideally one day, it is good to add unit test cases for run.sh and to be run by openshift/origin, to this repository's CI.
What I want is to run run.sh on Ruby 2.5.

Running run.sh on Ruby 2.5, that shows warnings like this.

/opt/app-root/src/bundle/ruby/2.5.0/gems/sinatra-1.4.5/lib/sinatra/base.rb:1217: warning: constant ::Fixnum is deprecated

But I think that this PR is still okay for the first step.

[1] #67
[2] openshift/origin#18522 (comment)

[0xmichalis]

@bparees we need to start gating PRs in this repo with the Origin e2e job

[0xmichalis]

cc @stevekuznetsov @mfojtik

[bparees]

@Kargakis that's basically impossible. the origin CI tests directly clone this repo from master to run their tests. There is no way to run those tests against the proposed changes, without significant refactoring of those tests.

[0xmichalis]

The test needs to be refactored to not make assumptions about cloning anyway. I think this will be enabled by @stevekuznetsov's work on the new job api.

[bparees]

@Kargakis cloning is part of what we are testing. we have to test our build functionality and part of that is "clone from a remote repo and build it"

[0xmichalis]

I see. Then, I guess this repo needs its own e2e test.

[bparees]

locally tested this, confirmed the app deploys and the DB is accessible. merging.

[junaruga]

@bparees thanks for your quick testing. That helps me.