Revert "Combine environment setting steps into one step with shell script (#1010)"

This reverts commit 5ccf419.

Author: AlmostMatt

.github/workflows/desktop.yml

@@ -312,6 +312,10 @@ jobs:
         with:
           ref: ${{needs.check_and_prepare.outputs.github_ref}}
           submodules: true
+      - name: Set env vars
+        run: |
+          echo "VCPKG_TRIPLET=x64-linux" >> $GITHUB_ENV
+          echo "VCPKG_RESPONSE_FILE=external/vcpkg_${{ env.VCPKG_TRIPLET }}_response_file.txt" >> $GITHUB_ENV
       - name: Cache vcpkg C++ dependencies
         id: cache_vcpkg
         uses: actions/cache@v2
@@ -328,12 +332,11 @@ jobs:
         with:
           python-version: ${{ fromJson(needs.prepare_matrix.outputs.matrix_python_version)[0] }}
       - name: Prepare for integration tests
-        uses: nick-invision/retry@v2
-        with:
-          shell: bash
-          timeout_minutes: 15
-          max_attempts: 3
-          command: scripts/gha/install_test_workflow_prereqs.sh -p Desktop -a 'x64' -s 'openssl'
+        run: |
+          pip install -r scripts/gha/requirements.txt
+      - name: Install OpenSSL
+        run: |
+          sudo apt install openssl
       - name: Build integration tests
         shell: bash
         env: