Support mongo server url path

[PuneetPunamiya]

• Previously when storage.docdb.mongo-server-url-dir was set, then value was read from the path specified in the field plus MONGO_SERVER_URL i.e. (for e.g. /mnt/mongo-creds-secret/MONGO_SERVER_URL) so user had to create the secret with the key MONGO_SERVER_URL

• Hence, with this patch user can specify the path now and the tokwn will be read from the path specified

Changes

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• [x] Has Docs included if any changes are user facing
• [ ] Has Tests included if any functionality added or changed
• [x] Follows the commit message standard
• [x] Meets the Tekton contributor standards (including functionality, content, code)
• [ ] Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• [ ] Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	73.6%	64.2%	-9.3

[PuneetPunamiya]

/test pull-tekton-chains-unit-tests

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	73.6%	54.1%	-19.4

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	73.6%	64.3%	-9.3

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	73.6%	64.3%	-9.3

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	73.6%	64.3%	-9.3

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	73.6%	64.3%	-9.3

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	73.6%	64.6%	-9.0

[PuneetPunamiya]

/test pull-tekton-chains-integration-tests

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/storage/docdb/docdb.go	48.8%	41.8%	-7.0

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jkhelil, lcarva

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/tektoncd/chains/blob/main/OWNERS)~~ [lcarva] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment