GODRIVER-2989 Fix golang installation in Dockerfile

.evergreen/config.yml

@@ -1520,6 +1520,7 @@ tasks:
  - func: run-atlas-data-lake-test
 
  - name: test-docker-runner
+ tags: ["pullrequest"]
  commands:
  - func: run-docker-test
 

Dockerfile

@@ -20,16 +20,26 @@ RUN cd /root && bash ./install-libmongocrypt.sh
 # from the libmongocrypt build stage.
 FROM drivers-evergreen-tools
 
+# Install common deps.
 RUN export DEBIAN_FRONTEND=noninteractive && \
  export TZ=Etc/UTC && \
  apt-get -qq update && \
- apt-get -qqy install --no-install-recommends \
- pkg-config \
+ apt-get -qqy install --reinstall --no-install-recommends \
  tzdata \
+ ca-certificates \
+ pkg-config \
+ software-properties-common \
  gpg \
  apt-utils \
  make && \
- apt-add-repository ppa:longsleep/golang-backports && \
+ sudo update-ca-certificates && \
+ rm -rf /var/lib/apt/lists/*
+
+# Install golang from the golang-backports ppa.
+RUN export DEBIAN_FRONTEND=noninteractive && \
+ export TZ=Etc/UTC && \
+ export LC_ALL=C.UTF-8 && \
+ sudo -E apt-add-repository "ppa:longsleep/golang-backports" && \
  apt-get -qq update && \
  apt-get -qqy install --no-install-recommends golang-go && \
  rm -rf /var/lib/apt/lists/*

docs/CONTRIBUTING.md

@@ -154,7 +154,7 @@ There is currently no arm64 support for the go1.x runtime, see [here](https://do
 
 ### Testing in Docker
 
-We support local testing in Docker. Ensure `docker` is installed and running, and then run:
+We support local testing in Docker.  To test using docker, you will need to set the `DRIVERS_TOOLs` environment variable to point to a local clone of the drivers-evergreen-tools repository. This is essential for running the testing matrix in a container. You can set the `DRIVERS_TOOLS` variable in your shell profile or in your project-specific environment.
 
 ```bash
 bash etc/run_docker.sh