support adding a CA cert to http collector

[adamancini]

Description, Motivation and Context

http collector now supports a cacert field and a proxy field, in order to support testing for man-in-the-middle proxies. This will be most useful in a HostPreflight scenario, checking whether the proxy CA cert provided by embedded-cluster install --private-ca can be used to successfully traverse the forward proxy. The expectation is that the proxy address and CA cert will be templated into a preflight spec at runtime.

These params are new and optional:

cacert: a path to a file, directory, or a literal string containing the CA certificate in PEM format

proxy: a URL to a proxy, including port and scheme: https://10.128.0.4:3130

E.g.:

- http:
        collectorName: https-replicated-proxy-cert-dir
        get:
          url: https://replicated.app
        tls:
          cacert: /usr/local/share/ca-certificates/replicated.app
        proxy: https://10.128.0.4:3130
    - http:
        collectorName: https-replicated-proxy-file
        get:
          url: https://replicated.app
        tls:
          cacert: /usr/local/share/ca-certificates/replicated.app/replicated.crt
        proxy: https://10.128.0.4:3130
    - http:
        collectorName: https-replicated-proxy-literal
        get:
          url: https://replicated.app
        tls:
          cacert: |-
            -----BEGIN CERTIFICATE-----
            MIIDajCCAlKgAwIBAgIUZJdSAOMxiY3cKU34KCtpK2ztkhUwDQYJKoZIhvcNAQEL
            BQAwTjELMAkGA1UEBhMCVVMxDjAMBgNVBAgMBVN0YXRlMQ0wCwYDVQQHDARDaXR5
            MRMwEQYDVQQKDApSZXBsaWNhdGVkMQswCQYDVQQLDAJJVDAeFw0yNDA5MjUxNDI0
            NTVaFw0yNDEwMDIxNDI0NTVaME4xCzAJBgNVBAYTAlVTMQ4wDAYDVQQIDAVTdGF0
            ZTENMAsGA1UEBwwEQ2l0eTETMBEGA1UECgwKUmVwbGljYXRlZDELMAkGA1UECwwC
            SVQwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDFaoJSv18TVLGFq2WC
            q6KOmlwfZpBXdgU1CYtg1HDwKUZ4/+WIcoHo+7yp+tt5TRA55r5d9YTlHWvQ+efh
            pRbIxmi7aTI9JyV9/jw3lDdVjShiNmdlNEGW7PYAihQkWLErMVcLspiZqmWB2Ar5
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            ABeMBfoB22gJtcRqJ2Rsp3HrkNzOu4i5xHQtj3f4UdEkxBAUZwME1SK3qFVOfI4i
            Gon4jFW0y0NYRuzYTypBuLbGoQ3RcOmpLfOSzhZL/aEE95QXHNH3L6QzVF4kZUin
            7sIRAgMBAAGjQDA+MA8GA1UdEQQIMAaHBAqAAAQwDAYDVR0TBAUwAwEB/zAdBgNV
            HQ4EFgQUqJTkHiOkT65YvZelWCn/JziGN5AwDQYJKoZIhvcNAQELBQADggEBADPt
            pdL++z00Ix75MVmjxU7QeLorpSeiU1j4z26VgomkuiC6iJrMKrYOGBsn7uMmALO8
            lVHDUCfAHs0Jv1vijkczT6I+fJiRYz0gnXYfMlPTH3Z082wVB5i0/ZZzv2hbO/cH
            Z8nmQvX3S+vOH5t9s/af1lxYzRno4Bo5CRzV5yoWHJT0dkAL8Xq16PWl+KUp6hel
            pVoo6uhBGcaJK5HY0WczyUY6ecMJ2BEwc0jNyYBKdkLAB3110axgFvtdBweHsEQv
            ISeaclwXuzYuVFr0BawyUSjenl0t8ybbKFfNrLyv6FHTNiqRup6SxORr3eLSv4dZ
            6Qg1Og0ne2dGJrebKy0=
            -----END CERTIFICATE-----
        proxy: https://10.128.0.4:3130

Relates to #1302

Depends on replicatedhq/embedded-cluster#1228

Checklist

• New and existing tests pass locally with introduced changes.
• Tests for the changes have been added (for bug fixes / features)
• The commit message(s) are informative and highlight any breaking changes
• Any documentation required has been added/updated. For changes to https://troubleshoot.sh/ create a PR here
• PR embedded-cluster to add a templated spec

Does this PR introduce a breaking change?

• Yes
• No

[banjoh]

@adamancini make schemas is failing

[banjoh]

Is proxy: still needed in the new implementation? I do not see the field defined anywhere in the code.

[adamancini]

Is proxy: still needed in the new implementation? I do not see the field defined anywhere in the code.

yeah we use it here https://github.com/replicatedhq/troubleshoot/pull/1624/files#diff-23221d86b2950ee7b3125067dcade43eaecff05f4ea2654ff278d97bafdad2a7R138

[adamancini]

added PR to embedded-cluster to add a spec to checklist - but this should be ready for review again @banjoh

[adamancini]

@banjoh I'll follow up with another PR to clean up the code at https://github.com/replicatedhq/troubleshoot/pull/1624/files#diff-23221d86b2950ee7b3125067dcade43eaecff05f4ea2654ff278d97bafdad2a7R113