ISSUE-1289: Superfluous 'output' workspace defined in git-cli env

[anilabhabaral]

Changes

Fix for #1289

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[tekton-robot]

Hi @anilabhabaral. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tekton-robot]

Catlin Output

``` FILE: task/git-cli/0.4/git-cli.yaml WARN : Step "git" uses image "$(params.BASE_IMAGE)" that contains variables; skipping validation ```

[anilabhabaral]

/assign @vinamra28

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vinamra28

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