[CI] Syntax fixes

.github/actions/upload-to-comsol/action.yml

@@ -13,9 +13,9 @@ runs:
   steps:
     - name: Upload file to ComSol
       run: |
-        curl {{ inputs.url }} \
-            -H "Authorization: {{ inputs.access_token }}" \
-            -F "file=@{{ inputs.file }}"
+        curl ${{ inputs.url }} \
+            -H "Authorization: ${{ inputs.access_token }}" \
+            -F "file=@${{ inputs.file }}"
 branding:
   icon: book
   color: red

.github/workflows/upload-ad.yml

@@ -12,6 +12,6 @@ jobs:
       - name: Upload to ComSol
         uses: ./.github/actions/upload-to-comsol
         with:
-          access_token: {{ secrets.TOKEN_AD }}
+          access_token: ${{ secrets.TOKEN_AD }}
           file: ./semester1/algorithms-and-datastructures/ad-janishutz.pdf
           url: https://exams.vis.ethz.ch/api/document/jahutz/summary-hs24_1/files/591/update/