chore: Use secrets file to get stripe publishable key in debug app

[jnewc]

Description

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Contributor Checklist

• All status checks have passed prior to code review
• I have added unit tests to a reasonable level of coverage where suitable
• I have added UI tests to new user flows, if applicable
• I have manually tested newly added UX
• I have open a documentation PR, if applicable

Reviewer Checklist

• I have verified that a suitable set of automated tests has been added
• I have verified that the title prefix aligns to the code changes + whether a release is expected after merging the PR
• I have verified the documentation PR aligns with this PR, if applicable

Before Merging

• If introducing a breaking change, I have communicated it internally
• Any related documentation PRs are ready to merge

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[github-actions]

	Warnings
⚠️	Please assign someone aside from CODEOWNERS (@checkout-pci-reviewers) to review this PR.

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[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud