replace hypens with underscore in pkgbuild version

.github/workflows/linux-makepkg.yml

@@ -51,7 +51,9 @@ jobs:
           install -d -m 0755 -o builder -g builder "$PKGDEST" "$SRCDEST"
       - name: Set package version
         run: |
-          sed -i -e 's|^pkgver=.*$|pkgver=${{ needs.get-version.outputs.semVerStr }}|' dist/linux/makepkg/PKGBUILD
+          sed -i -e 's|^pkgver=.*$|pkgver=${VERSION//-/_}|' dist/linux/makepkg/PKGBUILD
+        env:
+          VERSION: ${{ needs.get-version.outputs.semVerStr }}
       - name: Build package with makepkg
         working-directory: dist/linux/makepkg
         run: |