Support GH_API_URL to override GITHUB_API_URL

Author: jsoref

.github/workflows/test.yml

@@ -102,6 +102,16 @@ jobs:
         repository: check-spelling/.github
         trace: 1
 
+    - name: no hostname
+      id: no-hostname
+      continue-on-error: true
+      uses: ./action
+      with:
+        repository: check-spelling/.github
+        trace: 1
+      env:
+        GH_API_URL: http://a..a
+
     - name: check add to path
       shell: bash
       run: |

gh-program-downloader

@@ -29,7 +29,7 @@ curl_handle_error() {
 }
 
 list_releases() {
-  releases_url_base="$GITHUB_API_URL/repos/$repo/releases"
+  releases_url_base="${GH_API_URL:-$GITHUB_API_URL}/repos/$repo/releases"
   if [ -n "$version" ]; then
     releases_url="$releases_url_base/tags/$version"
   else