Create GitHub Actions workflow to build and test all the apps

[raisedadead]

When we update applications like automated package updates, we want to run tests and check if they are passing before merging PRs.

Tests could be as minimal as checking the health status endpoints created in #484 to more expanded versions where we run some unit or browser-based testing.

This issue may be split into multiple PRs, with one PR for every project.

Tasks

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1. 25--5-clock
2. american-british-translator
3. anonymous-message-board
4. bar-chart
5. build-a-pinterest-clone
6. cash-register
7. chart-the-stock-market
8. choropleth-map
9. drum-machine
10. exercise-tracker
11. file-metadata-microservice
12. forum-proxy
13. heat-map
14. image-search-abstraction-layer
15. issue-tracker
16. javascript-calculator
17. manage-a-book-trading-club
18. markdown-previewer
19. metric-imperial-converter
20. nightlife-coordination-app
21. p2p-video-chat-application
22. palindrome-checker
23. personal-library
24. personal-portfolio
25. pokeapi-proxy
26. pokemon-search-app
27. product-landing-page
28. random-quote-machine
29. request-header-parser-microservice
30. roman-numeral-converter
31. scatterplot-graph
32. secure-real-time-multiplayer-game
33. stock-price-checker-proxy
34. stock-price-checker
35. sudoku-solver
36. survey-form
37. technical-documentation-page
38. telephone-number-validator
39. timestamp-microservice
40. treemap-diagram
41. tribute-page
42. twitch-proxy
43. url-shortener-microservice
44. voting-app
45. weather-proxy