ci: move sbom into it's own file

.github/workflows/docker-build.yml

@@ -58,12 +58,3 @@ jobs:
           tag_name: ${{ steps.changelog.outputs.tag }}
           name: ${{ steps.changelog.outputs.tag }}
           body: ${{ steps.changelog.outputs.clean_changelog }}
-
-      - name: Syft SBOM
-        uses: anchore/sbom-action@v0
-        id: sbom
-        if: ${{ steps.changelog.outputs.skipped == 'false' }}
-        with:
-          image: registry.dangerous.tech/dangeroustech/zerotierbridge:latest
-          registry-username: ${{ secrets.REGISTRY_USERNAME }}
-          registry-password: ${{ secrets.REGISTRY_PASSWORD }}

.github/workflows/sbom.yml

@@ -0,0 +1,17 @@
+name: Generate SBOM
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  GenerateSBOM:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate SBOM
+        uses: anchore/sbom-action@v0
+        id: sbom
+        with:
+          image: registry.dangerous.tech/dangeroustech/zerotierbridge:latest
+          registry-username: ${{ secrets.REGISTRY_USERNAME }}
+          registry-password: ${{ secrets.REGISTRY_PASSWORD }}