chore(ci): add fossa

Author: deferred

.github/workflows/fossa.yml

@@ -0,0 +1,25 @@
+name: fossa
+permissions:
+  contents: read
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+  merge_group:
+    types: [checks_requested]
+jobs:
+  fossa:
+    runs-on: ubuntu-latest
+    if: github.actor != 'dependabot[bot]' && github.repository == 'G-Core/gcore-python'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install FOSSA CLI
+        run: |
+          curl -H 'Cache-Control: no-cache' https://raw.githubusercontent.com/fossas/fossa-cli/master/install-latest.sh | bash
+      - name: Set FOSSA API Key
+        run: echo "FOSSA_API_KEY=${{ secrets.FOSSA_PUB_API_KEY }}" >> $GITHUB_ENV
+      - name: Run FOSSA Analysis
+        run: fossa analyze
+      - name: Run FOSSA Test
+        run: fossa test