feature: add sbom and signing to the produced binaries (#143)

## Description

Related to open-component-model/ocm-project#82


## What type of PR is this? (check all applicable)

- [ ] 🍕 Feature
- [ ] 🐛 Bug Fix
- [ ] 📝 Documentation Update
- [ ] 🎨 Style
- [ ] 🧑‍💻 Code Refactor
- [ ] 🔥 Performance Improvements
- [ ] ✅ Test
- [ ] 🤖 Build
- [ ] 🔁 CI
- [ ] 📦 Chore (Release)
- [ ] ⏩ Revert

## Related Tickets & Documents

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- Related Issue # (issue)
- Closes # (issue)
- Fixes # (issue)
> Remove if not applicable

## Screenshots

<!-- Visual changes require screenshots -->


## Added tests?

- [ ] 👍 yes
- [ ] 🙅 no, because they aren't needed
- [ ] 🙋 no, because I need help
- [ ] Separate ticket for tests # (issue/pr)

Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce. Please also list any relevant details
for your test configuration


## Added to documentation?

- [ ] 📜 README.md
- [ ] 🙅 no documentation needed

## Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

.github/workflows/release.yaml

@@ -97,6 +97,10 @@ jobs:
       run: |
         mkdir -p output
         kustomize build ./config/default > ./output/install.yaml
+    - name: Setup Syft
+      uses: anchore/sbom-action/download-syft@7ccf588e3cf3cc2611714c2eeae48550fbc17552 # v0.15.11
+    - name: Setup Cosign
+      uses: sigstore/cosign-installer@v3.5.0
     - name: Run goreleaser
       uses: goreleaser/goreleaser-action@v5
       with:

.goreleaser.yaml

@@ -28,6 +28,24 @@ checksum:
     - glob: output/install.yaml
 snapshot:
   name_template: "{{ incpatch .Version }}-next"
+sboms:
+  - id: source
+    artifacts: source
+    documents:
+      - "{{ .ProjectName }}-{{ .Version }}-sbom.spdx.json"
+signs:
+  - cmd: cosign
+    env:
+      - COSIGN_EXPERIMENTAL=1
+    certificate: '${artifact}.pem'
+    args:
+      - sign-blob
+      - '--output-certificate=${certificate}'
+      - '--output-signature=${signature}'
+      - '${artifact}'
+      - '--yes'
+    artifacts: checksum
+    output: true
 changelog:
   sort: asc
   filters: