chore: Always pull Rust image when building in CI.

.drone.yml

@@ -5,6 +5,7 @@ name: default
 steps:
   - name: test
     image: rust
+    pull: always
     commands:
       - rustup component add clippy rustfmt
       - apt-get update -qq
@@ -14,6 +15,7 @@ steps:
       - cargo clippy --no-default-features --features=speech_dispatcher_0_10
   - name: release
     image: rust
+    pull: always
     commands:
       - apt-get update -qq
       - apt-get install -qqy llvm-dev libclang-dev clang libspeechd-dev pkg-config libx11-dev libasound2-dev libudev-dev libxcb-xfixes0-dev libwayland-dev libxkbcommon-dev libvulkan-dev libpulse-dev