GitHub CI: Fix check for release upload

Fixes an attempt to upload a release when triggering release actions manually.

.github/workflows/opendingux_release.yml

@@ -37,7 +37,7 @@ jobs:
         path: build-rg350/devilutionx-rg350.opk
 
     - name: Update Release
-      if: startsWith(github.ref, 'refs/tags/') && ${{ !env.ACT }}
+      if: github.event_name == 'release' && github.event.action == 'created' && ${{ !env.ACT }}
       uses: ncipollo/release-action@v1
       with:
         artifacts: "build-rg350/devilutionx-rg350.opk"

.github/workflows/retrofw_release.yml

@@ -38,7 +38,7 @@ jobs:
         path: build-retrofw/devilutionx-retrofw.opk
 
     - name: Update Release
-      if: startsWith(github.ref, 'refs/tags/') && ${{ !env.ACT }}
+      if: github.event_name == 'release' && github.event.action == 'created' && ${{ !env.ACT }}
       uses: ncipollo/release-action@v1
       with:
         artifacts: "build-retrofw/devilutionx-retrofw.opk"

.github/workflows/src_dist_release.yml

@@ -31,7 +31,7 @@ jobs:
         path: devilutionx-src.tar.xz
 
     - name: Update Release
-      if: startsWith(github.ref, 'refs/tags/') && ${{ !env.ACT }}
+      if: github.event_name == 'release' && github.event.action == 'created' && ${{ !env.ACT }}
       uses: ncipollo/release-action@v1
       with:
         artifacts: "devilutionx-src.tar.xz"