feat: switch to a single-container solution by removing PocketBase

[goniszewski]

Changes required by:

• Switch to a single-container solution by removing PocketBase

from https://github.com/users/goniszewski/projects/1/views/1?pane=issue&itemId=65225221

[goniszewski]

Status update

• [x] Database connections appear to be functioning correctly
• [ ] File uploads don't work yet

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[goniszewski]

Status update

• [x] Database connections appear to be functioning correctly
• [x] File uploads work
• [x] Docker build fixed