ci: Security scan ARM images

Scan ARM images using Anchore's scan action, by utilizing the Ubuntu ARM
runners provided by GitHub. While our ARM images are used only in macOS
silicon platforms, we can use the Ubuntu ARM runners just for scanning.

Closes #1008

.github/workflows/scan.yml

@@ -10,7 +10,12 @@ on:
 
 jobs:
   security-scan-container:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        runs-on:
+          - ubuntu-24.04
+          - ubuntu-24.04-arm
+    runs-on: ${{ matrix.runs-on }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -58,7 +63,12 @@ jobs:
           severity-cutoff: critical
 
   security-scan-app:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        runs-on:
+          - ubuntu-24.04
+          - ubuntu-24.04-arm
+    runs-on: ${{ matrix.runs-on }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4

.github/workflows/scan_released.yml

@@ -9,11 +9,10 @@ jobs:
     strategy:
       matrix:
         include:
-          - runs-on: ubuntu-latest
+          - runs-on: ubuntu-24.04
             arch: i686
-          # Do not scan Silicon mac for now to avoid masking release scan results for other plaforms.
+          - runs-on: ubuntu-24.04-arm
-          # - runs-on: macos-latest
+            arch: arm64
-          #   arch: arm64
     runs-on: ${{ matrix.runs-on }}
     steps:
       - name: Checkout
@@ -55,7 +54,12 @@ jobs:
           severity-cutoff: critical
 
   security-scan-app:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        runs-on:
+          - ubuntu-24.04
+          - ubuntu-24.04-arm
+    runs-on: ${{ matrix.runs-on }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4