Add support for environment variables for upload tokens

Author: MelanX

README.md

@@ -55,8 +55,14 @@ To set a property, set `<name>_<property>` in `mod.properties` where `<name>` is
 
 ## Secrets
 
+### Using a Secrets File
 ModUtils will look for a file named `secrets.properties` (the location can be changed with the environment variable `SECRET_PROPERTIES`) and load those properties into a global object named `secrets`. The keys for mod uploading are expected as `curse_auth` or `modrinth_auth` in that secret object.
 
+### Using Environment Variables
+If the corresponding keys are not found in the `secrets` file, ModUtils will check for the following environment variables:
+- `CURSEFORGE_UPLOAD_TOKEN` for CurseForge uploads.
+- `MODRINTH_UPLOAD_TOKEN` for Modrinth uploads.
+
 ## Mod properties
 
 The properties defined in `mod.properties` will be placed in a global object named `mod`. Also some other properties will be added to this. All `mod` properties can be found below. (Non-bold properties may be absent). A property can be accessed with `mod.<name>` where `<name>` is the property name. To check, whether a property is present, use `'<name>' in mod`.

scripts/mod/upload_curse.gradle

@@ -4,6 +4,8 @@ String curseChangelog = mod.gitChangelog()
 task curseforge(type: net.darkhax.curseforgegradle.TaskPublishCurseForge) {
     if ('curse_auth' in secrets) {
         apiToken = secrets.curse_auth.toString()
+    } else if (System.getenv('CURSEFORGE_UPLOAD_TOKEN')) {
+        apiToken = System.getenv('CURSEFORGE_UPLOAD_TOKEN')
     } else {
         apiToken = ''
     }

scripts/mod/upload_modrinth.gradle

@@ -4,6 +4,8 @@ String modrinthChangelog = mod.gitChangelog()
 modrinth {
     if ('modrinth_auth' in secrets) {
         token = secrets.modrinth_auth.toString()
+    } else if (System.getenv('MODRINTH_UPLOAD_TOKEN')) {
+        apiToken = System.getenv('MODRINTH_UPLOAD_TOKEN')
     } else {
         token = ''
     }