Docker compose support

[GerardSmit]

Added Docker compose support:

docker compose build
docker compose up

Backend

1. Fixed exception after applying migrations (Database.Migrate() opens the connection, so it was already open)
2. Fixed incorrect path in Dockerfile

Frontend

1. Added Dockerfile
2. Fixed next build by setting JS-target to "es2015" since private fields are used in src/services/openapi
3. Added a middleware to proxy the API calls to the backend (so you don't have to open two ports)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +44.96% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1bcd6fc)	607	37	6.10%
Head commit (5409d5d)	1569 (+962)	801 (+764)	51.05% (+44.96%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{You may notice some variations in coverage metrics with the latest Coverage engine update. For more details, visit the documentation}