actions: use github.workspace instead of platform specific environment variables

Author: joshtynjala

.github/workflows/api.yml

@@ -20,7 +20,7 @@ jobs:
           haxelib install lime 7.8.0 --quiet
           haxelib install openfl 8.9.7 --quiet
           haxelib install dox --quiet
-          haxelib dev feathersui-validators $GITHUB_WORKSPACE
+          haxelib dev feathersui-validators ${{ github.workspace }}
       - name: Build API reference
         working-directory: docs
         run: haxe docs.hxml

.github/workflows/flash.yml

@@ -19,6 +19,6 @@ jobs:
         run: |
           haxelib install lime 7.8.0 --quiet
           haxelib install openfl 8.9.7 --quiet
-          haxelib dev feathersui-validators $GITHUB_WORKSPACE
+          haxelib dev feathersui-validators ${{ github.workspace }}
       - name: Build Flash .swc library
         run: haxelib run openfl build flash -debug

.github/workflows/tests.yml

@@ -22,7 +22,7 @@ jobs:
           haxelib install lime 7.8.0 --quiet
           haxelib install openfl 8.9.7 --quiet
           haxelib install utest --quiet
-          haxelib dev feathersui-validators $GITHUB_WORKSPACE
+          haxelib dev feathersui-validators ${{ github.workspace }}
       - name: Run Tests
         working-directory: test
         run: haxelib run openfl test neko
@@ -44,7 +44,7 @@ jobs:
           haxelib install lime --quiet
           haxelib install openfl --quiet
           haxelib install utest --quiet
-          haxelib dev feathersui-validators $GITHUB_WORKSPACE
+          haxelib dev feathersui-validators ${{ github.workspace }}
       - name: Set up Node.js dependencies
         working-directory: test
         run: |
@@ -71,7 +71,7 @@ jobs:
           haxelib install lime --quiet
           haxelib install openfl --quiet
           haxelib install utest --quiet
-          haxelib dev feathersui-validators $GITHUB_WORKSPACE
+          haxelib dev feathersui-validators ${{ github.workspace }}
       - name: Run Tests
         working-directory: test
         run: haxelib run openfl test neko
@@ -90,7 +90,7 @@ jobs:
           haxelib install lime --quiet
           haxelib install openfl --quiet
           haxelib install utest --quiet
-          haxelib dev feathersui-validators $GITHUB_WORKSPACE
+          haxelib dev feathersui-validators ${{ github.workspace }}
       - name: Run Tests
         working-directory: test
         run: haxelib run openfl test hl