Add Go to the image

So we can use go tooling such as gitleaks

Dockerfile

@@ -5,14 +5,16 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 ARG NODE_VERSION=16.14.0
 ARG PRE_COMMIT_VERSION=v2.17.0
+ARG GO_VERSION=1.18.2
 # Install nodejs, pre-commit and make cache directory
 RUN (curl -sL https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-x64.tar.gz | tar -xz --strip-components=1 -C /usr/) \
     && npm -g update \
     && npm cache clean --force \
     && pip install --no-cache-dir pre-commit==${PRE_COMMIT_VERSION} \
-    && mkdir -p /pre-commit-cache
+    && mkdir -p /pre-commit-cache \
+    && curl -sL https://go.dev/dl/go${GO_VERSION}.linux-amd64.tar.gz | tar -xz -C /usr/local/
 
-ENV PRE_COMMIT_HOME=/pre-commit-cache
+ENV PATH="/usr/local/go/bin:${PATH}" PRE_COMMIT_HOME=/pre-commit-cache
 
 # Make a test directory and set default command to run pre-commit on it
 RUN mkdir /test