should work now

action.yml

@@ -9,12 +9,17 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - run: curl -o nim.tar.xz https://nim-lang.org/download/nim-${{ inputs.version }}-linux_x64.tar.xz
-    - run: tar -xf nim.tar.xz
-    - run: cd nim-${{ inputs.version }} && ./install.sh /usr/bin
-      shell: bash
-    - run: cp nim-${{ inputs.version }}/bin/* /usr/bin
-      shell: bash
-    - run: mkdir ./lib && mv /usr/lib/nim/* ./lib && mv ./lib /usr/lib/nim/lib # fixes nim not finding the system lib
-      shell: bash
-    - run: rm -fr nim.tar.gz nim-${{ inputs.version }} lib
+    - shell: bash
+      run: |
+        set -euxo pipefail
+        tempdir = $(mktemp -d)
+        pushd $tempdir
+        curl -o nim.tar.xz https://nim-lang.org/download/nim-${{ inputs.version }}-linux_x64.tar.xz
+        tar -xf nim.tar.xz
+        pushd nim-${{ inputs.version }}
+        ./install.sh /usr/bin
+        popd
+        cp nim-${{ inputs.version }}/bin/* /usr/bin
+        mkdir ./lib && mv /usr/lib/nim/* ./lib && mv ./lib /usr/lib/nim/lib # fixes nim not finding the system lib
+        popdir
+        rm -fr $tempdir