fallback to env.GITHUB_SERVER_URL if FORGEJO is not set

action.yml

@@ -36,8 +36,11 @@ runs:
     - run: |
         export FORGEJO="${{ inputs.url }}"
         if test -z "$FORGEJO"; then
-          export FORGEJO="${{ github.server_url }}"
+          export FORGEJO="${{ env.GITHUB_SERVER_URL }}"
         fi
+        # A trailing / will mean http://forgejo//api/v1 is used
+        # and it always 401 as of v1.19, because of the double slash
+        FORGEJO=${FORGEJO%%/}
         export REPO="${{ inputs.repo }}"
         if test -z "$REPO"; then
           export REPO="${{ github.repository }}"

testdata/upload-download/.forgejo/workflows/test.yml

@@ -8,7 +8,6 @@ jobs:
       - id: release-upload
         uses: SELF@vTest
         with:
-          url: FORGEJO_URL
           direction: upload
           tag: v1.0
           doer: testuser
@@ -18,7 +17,6 @@ jobs:
       - id: release-download
         uses: SELF@vTest
         with:
-          url: FORGEJO_URL
           direction: download
           tag: v1.0
           doer: testuser