also prepare build system before trying to use pyenv

.github/workflows/rust.yml

@@ -16,9 +16,13 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: Prepare build system
+      run: |
+        apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
+          libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
+          xz-utils tk-dev libffi-dev liblzma-dev
     - name: Prepare python
       run: |
-        set -x
         curl https://pyenv.run | bash
         { echo 'export PATH="$PYENV_ROOT/bin:$PATH"';
         echo 'eval "$(pyenv init -)"';