Feat: Add sbom_enabled and grype_enabled toggles

.github/workflows/gradle-build-test.yaml

@@ -75,7 +75,26 @@ on:
         type: boolean
         default: false
 
+      # --- SBOM ---
+      sbom_enabled:
+        description: >-
+          Generate an SBOM (set false to skip). The Grype scan reads
+          the SBOM, so skipping generation leaves it nothing to scan.
+          To keep the SBOM but drop the scan, use grype_enabled.
+        required: false
+        type: boolean
+        default: true
+
       # --- Grype scan ---
+      grype_enabled:
+        description: >-
+          Run the Grype vulnerability scan over the generated SBOM (set
+          false to skip). Decoupling is one-way: disabling the scan
+          keeps the SBOM, but disabling the SBOM also stops the scan,
+          which has nothing to read.
+        required: false
+        type: boolean
+        default: true
       grype_fail_on:
         description: 'Minimum severity that fails the Grype scan'
         required: false
@@ -528,7 +547,8 @@ jobs:
     # checkout and does not depend on the build's artefacts, so it keeps
     # producing the dependency-scan signal even when the build fails
     # (for example on a test failure).
-    if: ${{ !cancelled() && needs.build.result != 'skipped' }}
+    # yamllint disable-line rule:line-length
+    if: ${{ !cancelled() && needs.build.result != 'skipped' && inputs.sbom_enabled }}
     timeout-minutes: ${{ inputs.sbom_timeout_minutes }}
     permissions:
       contents: read
@@ -607,7 +627,8 @@ jobs:
     name: 'Grype Audit SBOM'
     runs-on: ubuntu-latest
     needs: 'sbom'
-    if: ${{ !cancelled() && needs.sbom.result == 'success' }}
+    # yamllint disable-line rule:line-length
+    if: ${{ !cancelled() && needs.sbom.result == 'success' && inputs.grype_enabled }}
     timeout-minutes: ${{ inputs.grype_timeout_minutes }}
     permissions:
       contents: read

.github/workflows/maven-build-test.yaml

@@ -87,7 +87,26 @@ on:
         type: boolean
         default: false
 
+      # --- SBOM ---
+      sbom_enabled:
+        description: >-
+          Generate an SBOM (set false to skip). The Grype scan reads
+          the SBOM, so skipping generation leaves it nothing to scan.
+          To keep the SBOM but drop the scan, use grype_enabled.
+        required: false
+        type: boolean
+        default: true
+
       # --- Grype scan ---
+      grype_enabled:
+        description: >-
+          Run the Grype vulnerability scan over the generated SBOM (set
+          false to skip). Decoupling is one-way: disabling the scan
+          keeps the SBOM, but disabling the SBOM also stops the scan,
+          which has nothing to read.
+        required: false
+        type: boolean
+        default: true
       grype_fail_on:
         description: 'Minimum severity that fails the Grype scan'
         required: false
@@ -594,7 +613,8 @@ jobs:
     # checkout and does not depend on the build's artefacts, so it keeps
     # producing the dependency-scan signal even when the build fails
     # (for example on a test failure).
-    if: ${{ !cancelled() && needs.build.result != 'skipped' }}
+    # yamllint disable-line rule:line-length
+    if: ${{ !cancelled() && needs.build.result != 'skipped' && inputs.sbom_enabled }}
     timeout-minutes: ${{ inputs.sbom_timeout_minutes }}
     permissions:
       contents: read
@@ -673,7 +693,8 @@ jobs:
     name: 'Grype Audit SBOM'
     runs-on: ubuntu-latest
     needs: 'sbom'
-    if: ${{ !cancelled() && needs.sbom.result == 'success' }}
+    # yamllint disable-line rule:line-length
+    if: ${{ !cancelled() && needs.sbom.result == 'success' && inputs.grype_enabled }}
     timeout-minutes: ${{ inputs.grype_timeout_minutes }}
     permissions:
       contents: read

examples/gradle/build-test/github.yaml

@@ -50,6 +50,8 @@ jobs:
     #   gradle_version: '8.10'        # pin Gradle (empty uses the wrapper)
     #   build_arguments: 'build'      # arguments for the gradle invocation
     #   test_permit_fail: false       # soft-fail tests
+    #   sbom_enabled: true            # false skips SBOM generation
+    #   grype_enabled: true           # false skips the Grype scan only
     #   grype_fail_on: 'medium'       # Grype severity gate
     #   harden_runner_egress: 'block' # 'block' (default) or 'audit'
     #   build_timeout_minutes: 45     # raise for large reactors

examples/maven/build-test/github.yaml

@@ -52,6 +52,8 @@ jobs:
     #   mvn_profiles: ''             # comma-separated Maven profiles
     #   run_jacoco: true              # produce JaCoCo coverage
     #   test_permit_fail: false       # soft-fail tests
+    #   sbom_enabled: true            # false skips SBOM generation
+    #   grype_enabled: true           # false skips the Grype scan only
     #   grype_fail_on: 'medium'       # Grype severity gate
     #   harden_runner_egress: 'block' # 'block' (default) or 'audit'
     #   build_timeout_minutes: 45     # raise for large reactors