Add auth properties

.github/workflows/gradle.yml

@@ -13,6 +13,5 @@ jobs:
       uses: actions/setup-java@v1
       with:
         java-version: 1.8
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Build with Gradle
-      run: ./gradlew publish
+      run: ./gradlew -Pgpr.user=dmdirc -Pgpr.key=${{ secrets.GITHUB_TOKEN }} publish

build.gradle

@@ -52,8 +52,8 @@ publishing {
             name = "GitHubPackages"
             url = uri("https://maven.pkg.github.com/dmdirc/util")
             credentials {
-                username = findProperty("GITHUB_USERNAME")
-                password = findProperty("GITHUB_API_TOKEN")
+                username = project.findProperty("gpr.user") ?: System.getenv("USERNAME")
+                password = project.findProperty("gpr.key") ?: System.getenv("PASSWORD")
             }
         }
     }