Fix event capturing on Linux

[tustanivsky]

In order to fix events capturing on Linux in CI environment two changes were required:

• Give user write access to the sample project directory that allows sentry-native to initialize itself properly (needed to create .sentry-native folder at a given database path, project root in this case)
• Ensure that CA certs are at the right location (needed for sending captured events to Sentry with curl)

Closes #100