CI: The set-env and add-path commands are deprecated and will be disabled on November 16th. (#37812)

Author: simonjayhawkins

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
 
     - name: Setting conda path
-      run: echo "::add-path::${HOME}/miniconda3/bin"
+      run: echo "${HOME}/miniconda3/bin" >> $GITHUB_PATH
 
     - name: Checkout
       uses: actions/checkout@v1
@@ -98,7 +98,7 @@ jobs:
     steps:
 
     - name: Setting conda path
-      run: echo "::set-env name=PATH::${HOME}/miniconda3/bin:${PATH}"
+      run: echo "${HOME}/miniconda3/bin" >> $GITHUB_PATH
 
     - name: Checkout
       uses: actions/checkout@v1