Use tmp dir

use tmp dir
test calling script twice
test latest master, and current

.github/workflows/test.yml

@@ -15,10 +15,30 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    - uses: ./
+      with:
+        macos: echo "Hi from macos"
+        linux: |
+          echo "Hi from linux"
+          echo "Hi from linux second line"
+        windows: echo "Hi from windows"
+
+    - uses: ./
+      with:
+        macos: echo "test2"
+        linux: echo "test2"
+        windows: echo "test2"
+
     - uses: knicknic/os-specific-run@master
       with:
         macos: echo "Hi from macos"
         linux: |
           echo "Hi from linux"
           echo "Hi from linux second line"
-        windows: echo "Hi from windows"
+        windows: echo "Hi from windows"
+
+    - uses: knicknic/os-specific-run@master
+      with:
+        macos: echo "test2"
+        linux: echo "test2"
+        windows: echo "test2"

dist/index.js

@@ -1631,7 +1631,10 @@ async function body() {
         let command =  '';
         let unformattedShell = '';
 
-        let file = path.join(process.env.GITHUB_WORKSPACE, uuidv4())
+        let tmpPath = path.join(path.sep, 'tmp', 'knicknic', 'os-specific-run')
+        await fs.promises.mkdir(tmpPath, { recursive: true });
+
+        let file = path.join(tmpPath, uuidv4())
 
         // https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#using-a-specific-shell
 

index.js

@@ -43,7 +43,10 @@ async function body() {
         let command =  '';
         let unformattedShell = '';
 
-        let file = path.join(process.env.GITHUB_WORKSPACE, uuidv4())
+        let tmpPath = path.join(path.sep, 'tmp', 'knicknic', 'os-specific-run')
+        await fs.promises.mkdir(tmpPath, { recursive: true });
+
+        let file = path.join(tmpPath, uuidv4())
 
         // https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#using-a-specific-shell