fix tests, add CI, fix on mac, extend docs (#25)

* tests: fix float problems and PAT problem

* extend CONTRIBUTING.md

* extend build documentation, add GH action, fix build on MacOS

* fix build on Vercel

* update .gitignore and CONTRIBUTING.md

* fix all tests

* add backend tests to CI

* make e2e tests work

* add debug log to e2e test

* ignore copied tests in CI

.github/workflows/basic-build.yml

@@ -0,0 +1,37 @@
+name: Basic Build
+
+on:
+  workflow_dispatch: # Allows you to run this manually from the Actions tab
+  push:
+  pull_request:
+
+jobs:
+  execute:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: latest
+
+      - name: Install Yarn
+        run: npm install -g yarn
+
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Install and Build
+        run: |
+          chmod +x ./vercel-preparation.sh
+          ./vercel-preparation.sh
+          (cd ./backend/ && npm install)
+          (cd ./frontend/frontend/ && yarn install && yarn build-trends)
+
+      - name: Run Backend Tests
+        run: |
+            (cd ./backend/ && npm test)