fix: remove remaining Gleam references from Dockerfile (#203)

Reviewed-on: graham/towerops-web#203

k8s/Dockerfile

@@ -31,29 +31,21 @@ RUN apt-get update \
     && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends build-essential git curl libsnmp-dev \
     && rm -rf /var/lib/apt/lists/*
 
-# Install Gleam compiler
-ARG GLEAM_VERSION=1.15.2
-RUN curl -fsSL https://github.com/gleam-lang/gleam/releases/download/v${GLEAM_VERSION}/gleam-v${GLEAM_VERSION}-x86_64-unknown-linux-musl.tar.gz \
-    | tar xz -C /usr/local/bin/
-
 # prepare build dir
 WORKDIR /app
 
 # set build ENV
 ENV MIX_ENV="prod"
 
-# install hex + rebar + mix_gleam archive (must use cache mounts so they
-# persist into subsequent cache-mounted steps)
+# install hex + rebar
 RUN --mount=type=cache,target=/root/.hex \
     --mount=type=cache,target=/root/.mix \
     mix local.hex --force \
-    && mix local.rebar --force \
-    && mix archive.install hex mix_gleam --force
+    && mix local.rebar --force
 
 # install mix dependencies
-COPY mix.exs mix.lock gleam.toml ./
+COPY mix.exs mix.lock ./
 COPY vendor vendor
-COPY src src
 RUN --mount=type=cache,target=/root/.hex \
     --mount=type=cache,target=/root/.mix \
     mix deps.get --only $MIX_ENV