chore: add build scripts

[AsCress]

Adds build scripts to the flutter branch.

Screenshots / Recordings

N/A

Checklist:

• No hard coding: I have used resources from strings.xml, dimens.xml and colors.xml without hard coding any value.
• No end of file edits: No modifications done at end of resource files strings.xml, dimens.xml or colors.xml.
• Code reformatting: I have reformatted code and fixed indentation in every file included in this pull request.
• No extra space: My code does not contain any extra lines or extra spaces than the ones that are necessary.

Summary by Sourcery

Build:

• Add a script to decrypt and extract secrets for the build process.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds build scripts to handle decryption and extraction of secret files during the build process. The implementation uses OpenSSL for decryption and tar for file extraction, along with proper gitignore settings.

Sequence diagram for build script execution

sequenceDiagram
    participant Developer
    participant BuildServer
    participant OpenSSL
    participant Tar

    Developer->>BuildServer: Trigger build
    BuildServer->>OpenSSL: Decrypt secrets.tar.enc
    OpenSSL-->>BuildServer: Decrypted secrets.tar
    BuildServer->>Tar: Extract secrets.tar
    Tar-->>BuildServer: Extracted files
    BuildServer-->>Developer: Build complete

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File-Level Changes

Change	Details	Files
Added script for decrypting and extracting secret files	Created a shell script that uses OpenSSL to decrypt secrets using environment variables Implemented tar extraction of decrypted secrets to the scripts directory Added error handling with set -e flag Added gitignore to prevent secret files from being committed	scripts/prep-key.sh scripts/.gitignore

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[sourcery-ai]

Hey @AsCress - I've reviewed your changes - here's some feedback:

Overall Comments:

• The .gitignore file appears to be empty. Please ensure it includes proper exclusions for sensitive files (*.tar, decrypted secrets, etc) to prevent accidental commits of sensitive data.
• Consider following standardized environment variable naming conventions for encryption keys/IVs (e.g., prefixed with PROJECT_NAME_). Also, adding basic error messages when decryption fails would improve debugging.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟡 Security: 1 issue found
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-android/actions/runs/11745355721/artifacts/2163924859