Change TLS MinVersion to tls.VersionTLS12 in order to make Triggers run on OCP where FIPS enabled

[savitaashture]

Changes

• Fixes: tls: client offered only unsupported versions #1463 this issue occurs on Openshift cluster where fips are enabled

  Issue: http: TLS handshake error from 10.128.2.1:36306: tls: client offered only unsupported versions: [303]
  RCA:

  1. During peer-peer https communication, when TLS handshake is happening, at a stage where both server and client mutually agree for a common TLS version and cipher,, The Triggers Interceptor server is enabled or only allow TLS 1.3 and corresponding ciphers today, where the client(OCP) giving a TLS 1.2 tls version and cipher(Based on error http: TLS handshake error from 10.128.2.1:36306: tls: client offered only unsupported versions: [303] Ref,)
     which result in the TLS handshake not happening as there is no mutual TLS version to negotiate from both (server and client ) side

  2. OCP uses MInTLS as 1.2 for all components

  Fix:

  1. Changed MinVersion to tls.VersionTLS12 and it works on both K8S and OCP

• Moved config/interceptors/interceptor-secrets.yaml to config/interceptors/00-interceptor-secrets.yaml so that secrets will be created before core-intercetor pod start this solves issue like tekton-triggers-core-interceptors-certs not found

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Release Notes

Changed TLS MinVersion to `tls.VersionTLS12` in order to make Triggers run on OCP(Where FIPS enabled) as OCP uses MInTLS as 1.2 for all components

[khrm]

/lgtm

[savitaashture]

/test pull-tekton-triggers-integration-tests

[khrm]

/lgtm

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