feat(out): add concourse_url source field to override ATC_EXTERNAL_URL - #20
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Concourse's externalUrl Helm value may be locked to an STS WebIdentity OIDC issuer hostname that differs from the URL users actually reach builds through (e.g. via a Teleport proxy). When concourse_url is set in the resource source, it overrides ATC_EXTERNAL_URL at the start of Out() so that both safeExpandEnv and the auto-generated commit status target URL in UpdateCommitStatus point to the correct public hostname.
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Concourse's externalUrl Helm value may be locked to an STS WebIdentity OIDC issuer hostname that differs from the URL users actually reach builds through (e.g. via a Teleport proxy). When concourse_url is set in the resource source, it overrides ATC_EXTERNAL_URL at the start of Out() so that both safeExpandEnv and the auto-generated commit status target URL in UpdateCommitStatus point to the correct public hostname.