Adding a double quote into a Slack notification string results in a template error

[jamietanna]

What happened?

When using Slack notifications via blocks or attachments, a template error is seen when using " in the message, for instance when {{ envOrDefault "USER" "" }}

We receive the following error:

slack blocks: failed to evaluate template: template: failed to apply "[{\"text\":{\"text\":\"The current user is {{ envOrDefault \\\"USER\\\" \\\"\\\" }}\",\"type\":\"plain_text\"},\"type\":\"header\"}]": unexpected "\\" in operand

This occurs for both single quoted strings and double quoted strings containing the values:

    blocks:
      - type: header
        text:
          type: plain_text
          text: 'The current user is {{ envOrDefault "USER" "" }}'
    attachments:
        -
          title: Release artifacts
          color: '#2eb886'
            text: |
              The current user is {{ envOrDefault "USER" "" }}

How can we reproduce this?

I've raised a draft PR at #4555 which introduces the test code to reproduce.

goreleaser version

Reproducible on HEAD, commit d15dab3a797e744fac0d0577fc2e3c4ab7a2b758

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Additional context

#4555 is the tests to show the issue