Adding a variable for minio-service endpoint

[DharmitD]

The issue resolved by this Pull Request:

Resolves #375

Description of your changes:

Replacing hardcode references to minio-service endpoints with an environment variable.

Testing instructions

• Build an image with changes in this PR. This is the image I built with these changes: quay.io/rhn_support_ddalvi/data-science-pipelines-operator:minio-revised
• Deploy DSPO and create a DSPA instance
• Make sure minio pod comes up correctly
• Create a run using the default pipeline to make sure it goes through correctly.

Checklist

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[dsp-developers]

A new image has been built to help with testing out this PR: quay.io/opendatahub/data-science-pipelines-operator:pr-479
An OCP cluster where you are logged in as cluster admin is required.

To use this image run the following:

cd $(mktemp -d)
git clone [email protected]:opendatahub-io/data-science-pipelines-operator.git
cd data-science-pipelines-operator/
git fetch origin pull/479/head
git checkout -b pullrequest 89fb58911d701a1ff99da72cfbe74b5ab85aebd2
make deploy IMG="quay.io/opendatahub/data-science-pipelines-operator:pr-479"

More instructions here on how to deploy and test a Data Science Pipelines Application.

[dsp-developers]

Change to PR detected. A new PR build was completed.
A new image has been built to help with testing out this PR: quay.io/opendatahub/data-science-pipelines-operator:pr-479

[dsp-developers]

Change to PR detected. A new PR build was completed.
A new image has been built to help with testing out this PR: quay.io/opendatahub/data-science-pipelines-operator:pr-479

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gmfrasca

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