feat(setup-trivy)!: automatically determine arch (#14)

Mapping x86_64 to "64bit" and aarch64 to "ARM64" as this is how Trivy names their releases.
Adjusted CICD to test-run both amd64 and arm64 versions.

Reviewed-on: t.behrendt/trivy-actions#14
Reviewed-by: branch-buddy <branch-buddy@t00n.de>
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

setup-trivy/action.yaml

@@ -7,45 +7,34 @@ branding:
 
 inputs:
   version:
-    description: "Trivy version to download (e.g., v0.66.0)"
+    description: "Trivy version to download (e.g., latest)"
     required: false
     default: "v0.66.0"
-  architecture:
-    description: "System architecture (amd64, arm64)"
-    required: false
-    default: "amd64"
 
 runs:
   using: "composite"
   steps:
+    - shell: bash
+      id: arch
+      run: |
+        set -e
+        case "$(uname -m)" in
+          x86_64)
+            ARCH="64bit"
+            ;;
+          aarch64)
+            ARCH="ARM64"
+            ;;
+        esac
+        echo "ARCH=$ARCH" >> $GITHUB_OUTPUT
     - name: Cache Trivy binary
       id: cache-trivy
       uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
       with:
         path: /usr/local/bin/trivy
-        key: trivy-${{ inputs.version }}-${{ inputs.architecture }}
+        key: trivy-${{ inputs.version }}-${{ steps.arch.outputs.arch }}
         restore-keys: |
-          trivy-${{ inputs.version }}-${{ inputs.architecture }}-
-          trivy-${{ inputs.version }}-
-
-    - name: Validate inputs
-      shell: bash
-      run: |
-        set -e
-
-        VERSION="${{ inputs.version }}"
-        ARCH="${{ inputs.architecture }}"
-
-        # Validate architecture
-        case "$ARCH" in
-          amd64|arm64)
-            ;;
-          *)
-            echo "Error: Unsupported architecture '$ARCH'. Supported: amd64, arm64"
-            exit 1
-            ;;
-        esac
-
+          trivy-${{ inputs.version }}-${{ steps.arch.outputs.arch }}
     - name: Download and install Trivy
       if: steps.cache-trivy.outputs.cache-hit != 'true'
       shell: bash
@@ -53,20 +42,10 @@ runs:
         set -e
 
         VERSION="${{ inputs.version }}"
-        ARCH="${{ inputs.architecture }}"
-
-        case "$ARCH" in
-          amd64)
-            ARCH="64bit"
-            ;;
-          arm64)
-            ARCH="ARM64"
-            ;;
-        esac
 
         mkdir -p /usr/local/bin
 
-        curl -sL "https://github.com/aquasecurity/trivy/releases/download/${VERSION}/trivy_${VERSION#v}_Linux-${ARCH}.tar.gz" -o trivy.tar.gz
+        curl -sL "https://github.com/aquasecurity/trivy/releases/download/${VERSION}/trivy_${VERSION#v}_Linux-${{ steps.arch.outputs.arch }}.tar.gz" -o trivy.tar.gz
         tar -xzf trivy.tar.gz
         chmod +x trivy
         mv trivy /usr/local/bin/