CI: use MP API key from secrets

.github/workflows/cicd.yml

@@ -13,22 +13,17 @@ jobs:
     strategy:
       matrix:
         python-version: [3.8]
+    env:
+      DEMO_ACCOUNT_ID: ${{ secrets.DEMO_ACCOUNT_ID }}
+      DEMO_AUTH_TOKEN: ${{ secrets.DEMO_AUTH_TOKEN }}
+      MATERIALS_PROJECT_API_KEY: ${{ secrets.MATERIALS_PROJECT_API_KEY }}
 
     steps:
       - name: Checkout this repository
         uses: actions/checkout@v3
         with:
           lfs: true
 
-      - name: Prepare environment variables
-        shell: bash -l {0}
-        run: |
-          export DEMO_ACCOUNT_ID="${{ secrets.DEMO_ACCOUNT_ID }}"
-          echo "DEMO_ACCOUNT_ID=${DEMO_ACCOUNT_ID}" >> $GITHUB_ENV
-
-          export DEMO_AUTH_TOKEN="${{ secrets.DEMO_AUTH_TOKEN }}"
-          echo "DEMO_AUTH_TOKEN=${DEMO_AUTH_TOKEN}" >> $GITHUB_ENV
-
       - name: Install dependencies
         shell: bash -l {0}
         run: |
@@ -56,8 +51,7 @@ jobs:
 
           settings["ACCOUNT_ID"] = os.getenv("DEMO_ACCOUNT_ID", "")
           settings["AUTH_TOKEN"] = os.getenv("DEMO_AUTH_TOKEN", "")
-          # TODO: update secrets with the MP API key
-          # settings["MATERIALS_PROJECT_API_KEY"] = "MATERIALS_PROJECT_API_KEY"
+          settings["MATERIALS_PROJECT_API_KEY"] = os.getenv("MATERIALS_PROJECT_API_KEY", "")
 
           with open(settings_file, "w") as fp:
               json.dump(settings, fp, indent=4)