Update rust version in dockerfile (#633)

* Update rust version in dockerfile

Apparently it was there twice, I missed it. I wonder why it's there twice

* Build docker file in github actions

Author: LMG

.github/workflows/rust.yml

@@ -62,3 +62,10 @@ jobs:
         trunk --config=josh-ui/Trunk.toml build
         sh run-tests.sh tests/filter/*.t
         sh run-tests.sh tests/proxy/*.t
+  build-dockerfile:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: satackey/action-docker-layer-caching@v0.0.11
+    - name: Build docker file
+      run: docker build .

Dockerfile

@@ -1,4 +1,4 @@
-FROM rust:1.54 as builder
+FROM rust:1.58.1 as builder
 
 RUN apt-get update \
  && apt-get install -y cmake \