Update GitHub Actions pipeline for signing

.github/workflows/build.yml

@@ -1 +1,57 @@
+name: Sign AViewer Executable
 
+on:
+  push:
+    branches:
+      - signav
+  workflow_dispatch:
+
+jobs:
+  sign-exe:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+
+      - name: Retrieve Existing .exe File
+        run: |
+          if (Test-Path -Path "package/release/aViewer2.0.3.exe") {
+            Write-Output "Executable found, proceeding with signing."
+          } else {
+            Write-Error "Executable not found! Check repository structure."
+            exit 1
+          }
+
+      - name: Download Jsign
+        run: |
+          curl -L -o jsign.jar https://github.com/ebourg/jsign/releases/download/6.0/jsign-6.0.jar
+        shell: bash
+
+      - name: Sign Executable with AWS KMS
+        run: |
+          java -jar jsign.jar `
+                --storetype AWS `
+                --keystore "${{ secrets.AWS_REGION }}" `
+                --storepass "${{ secrets.AWS_ACCESS_KEY }}|${{ secrets.AWS_SECRET_KEY }}" `
+                --alias "${{ secrets.KMS_ARN }}" `
+                --certfile "${{ secrets.CERT_PATH }}" `
+                --alg "SHA256" `
+                --tsaurl "http://timestamp.digicert.com" `
+                --tsretries 10 `
+                package/release/aViewer2.0.3.exe
+
+      - name: Upload Signed Executable
+        uses: actions/upload-artifact@v3
+        with:
+          name: signed-aviewer
+          path: package/release/aViewer2.0.3.exe
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: v1.0.${{ github.run_number }}
+          files: package/release/aViewer2.0.3.exe
+          body: "Signed release of AViewer"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}