Description of problem:

Self signed certificates are no longer respected by the git resolver in 1.19, making resolving remote tasks from private/self-hosted git provider result in a failure to validate the self-signed certificate.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Host gitea at domain which uses a self-signed certificate
2. Create a repo in gitea which contains a pipeline yaml file
3. In an Openshift cluster, configure the Openshift Proxy to use the self-signed cert following this documentation: https://github.com/openshift/openshift-docs/blob/a8269cf65696fbd08647c8f3b5d065d53a8a1f52/modules/certificate-injection-using-operators.adoc
4.  Install Openshift Pipelines in the cluster
5. Create a PipelineRun which uses the git-resolver to pull the pipeline from gitea

Actual results:

The git-resolver fails because it cannot validate gitea's certificate

Expected results:

The git-resolver succeeds to pull the pipelinerun, validating gitea's certificate using the certificate bundle mounted from the configmap config-trusted-cabundle

Reproducibility (Always/Intermittent/Only Once): Always

Acceptance criteria: 

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):

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