Fix Gleam module compilation in Docker build

- Add src directory to Dockerfile COPY commands
- Include gleam.toml in Docker build
- Add mix gleam.compile step before mix compile
- Fixes UndefinedFunctionError for :aprsme@encoding:sanitize_string/1

The Gleam source files weren't being included in the Docker build,
causing the encoding module to be missing at runtime.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -24,7 +24,7 @@ RUN mix local.hex --force && \
 ENV MIX_ENV=prod
 
 # Install mix dependencies
-COPY mix.exs mix.lock ./
+COPY mix.exs mix.lock gleam.toml ./
 COPY vendor vendor
 RUN mix deps.get --only $MIX_ENV && \
     mix deps.compile
@@ -32,6 +32,7 @@ RUN mix deps.get --only $MIX_ENV && \
 # Copy and compile application
 COPY config config
 COPY lib lib
+COPY src src
 COPY assets assets
 COPY priv priv
 COPY rel rel
@@ -40,6 +41,7 @@ COPY rel rel
 RUN cd vendor/aprs && mix compile && cd ../.. && \
     mkdir -p _build/prod/lib/aprs/ebin && \
     cp -r vendor/aprs/_build/prod/lib/aprs/ebin/* _build/prod/lib/aprs/ebin/ && \
+    mix gleam.compile && \
     mix compile && \
     mix assets.deploy && \
     mix release