ci: add FOSSA scanning workflow (#683)

Signed-off-by: Guilherme Macedo <guilherme@gmacedo.com>

.github/workflows/fossa.yml

@@ -0,0 +1,34 @@
+name: FOSSA Scanning
+
+on:
+  push:
+    branches: ["main", "release-harvester-v*"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  fossa-scanning:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+    - name: Checkout
+      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
+
+    # The FOSSA token is shared between all repos in Harvester's GH org. It can
+    # be used directly and there is no need to request specific access to EIO.
+    - name: Read FOSSA token
+      uses: rancher-eio/read-vault-secrets@main
+      with:
+        secrets: |
+          secret/data/github/org/harvester/fossa/credentials token | FOSSA_API_KEY_PUSH_ONLY
+
+    - name: FOSSA scan
+      uses: fossas/fossa-action@main
+      with:
+        api-key: ${{ env.FOSSA_API_KEY_PUSH_ONLY }}
+        # Only runs the scan and do not provide/returns any results back to the
+        # pipeline.
+        run-tests: false