Tooling: Add fossa and mend github ci jobs

.github/workflows/fossa.yml

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+name: Fossa
+
+on:
+    workflow_dispatch:
+        inputs:
+          branch:
+            type: string
+            required: false
+            default: main
+
+concurrency:
+  group: ${{ github.ref_name }}-fossa
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  scan:
+    name: Fossa
+    runs-on: ubuntu-24.04
+    if: ${{ github.event.repository.fork == false }}
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@85e6279cec87321a52edac9c87bce653a07cf6c2 # v4.2.2
+
+      - name: Scan
+        uses: fossas/fossa-action@93a52ecf7c3ac7eb40f5de77fd69b1a19524de94 # v1.5.0
+        with:
+          api-key: ${{ secrets.FOSSA_TOKEN }}

.github/workflows/mend.yml

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+name: Mend
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        type: string
+        required: false
+        default: main
+
+concurrency:
+  group: ${{ github.ref_name }}-mend
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  scan:
+    name: Mend
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@85e6279cec87321a52edac9c87bce653a07cf6c2 # v4.2.2
+        with:
+          ref: ${{ inputs.branch && inputs.branch || github.ref }}
+
+      - name: Download agent
+        run: curl -fsSLJO https://github.com/whitesource/unified-agent-distribution/releases/latest/download/wss-unified-agent.jar
+
+      - name: Verify JAR
+        run: jarsigner -verify wss-unified-agent.jar
+
+      - name: Scan and upload
+        env:
+          PRODUCT_NAME: nginx_documentation_${{ inputs.branch && inputs.branch || github.ref_name }}
+          PROJECT_NAME: nic
+        run: java -jar wss-unified-agent.jar -noConfig true -wss.url ${{ secrets.WSS_URL }} -apiKey ${{ secrets.WS_APIKEY_NGINX }} -product ${{ secrets.WS_PRODUCT }} -project ${{ secrets.WS_PROJECT }} -d .