diff --git a/.gitea/workflows/release.yml b/.gitea/workflows/release.yml
index 9dce398..d7443ac 100644
--- a/.gitea/workflows/release.yml
+++ b/.gitea/workflows/release.yml
@@ -138,9 +138,19 @@ jobs:
       - name: Build the installer
         run: ./Packaging/build-installer.ps1 -Version ${{ steps.version.outputs.plain }}
 
-      # The artifact is where the package waits to be uploaded to Partner Center
+      # The artifact is where the package waits to be uploaded to Partner Center.
+      #
+      # GITHUB_SERVER_URL is put back to github.com for these two steps alone.
+      # The action reads it to tell a GitHub Enterprise Server from github.com
+      # and refuses to run on anything else with a GHESNotSupportedError, Gitea
+      # included — although Gitea answers the very requests the action makes.
+      # The upload goes to ACTIONS_RESULTS_URL, which is left as Gitea set it,
+      # so the substitution reaches the check and nothing else. The artifact-url
+      # output comes out pointing at github.com; nothing here reads it
       - name: Keep the package
         uses: actions/upload-artifact@v4
+        env:
+          GITHUB_SERVER_URL: https://github.com
         with:
           name: msix-${{ steps.version.outputs.version }}
           path: artifacts/packages/
@@ -150,6 +160,8 @@ jobs:
       # only when something has to be traced back to the WiX source
       - name: Keep the installer
         uses: actions/upload-artifact@v4
+        env:
+          GITHUB_SERVER_URL: https://github.com
         with:
           name: installer-${{ steps.version.outputs.plain }}
           path: artifacts/installers/*.msi
@@ -167,10 +179,8 @@ jobs:
 
           # The GITHUB_ names are what Gitea itself hands to the workflow — its
           # actions repeat those of GitHub, and the addresses in them point at
-          # this Gitea instance. GITHUB_API_URL used not to reach the steps at
-          # all, so the address is put together from the server one when empty
-          $root = if ($env:GITHUB_API_URL) { $env:GITHUB_API_URL } else { "$env:GITHUB_SERVER_URL/api/v1" }
-          $api = "$root/repos/$env:GITHUB_REPOSITORY/releases"
+          # this Gitea instance
+          $api = "$env:GITHUB_API_URL/repos/$env:GITHUB_REPOSITORY/releases"
           $headers = @{ Authorization = "token $env:GITEA_TOKEN" }
 
           # Gitea makes a release of its own for a pushed tag, so the release is