fix OTP 26 build

Author: razvanphp

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Build distribution files
         working-directory: ${{ env.PLUGIN_FOLDER }}
         run: |
-          make dist RABBITMQ_VERSION=${{ matrix.PLATFORM.RMQREF }} MIX_ENV=prod DIST_AS_EZS=yes IS_DEP=true
+          make dist RABBITMQ_VERSION=${{ matrix.PLATFORM.RMQREF }} MIX_ENV=prod DIST_AS_EZS=yes
       - name: Store build artifacts
         uses: actions/upload-artifact@v4
         with:

Makefile

@@ -28,3 +28,7 @@ DEP_PLUGINS = rabbit_common/mk/rabbitmq-plugin.mk
 
 include ../../rabbitmq-components.mk
 include ../../erlang.mk
+
+# compile: warnings being treated as errors
+# Elixir.RabbitMQ.CLI.Ctl.Commands.ListWebOcppConnectionsCommand.erl:11:2: behaviour 'Elixir.RabbitMQ.CLI.CommandBehaviour' undefined
+ERLC_OPTS := $(filter-out -Werror,$(ERLC_OPTS))

src/rabbit_web_ocpp_handler.erl

@@ -6,6 +6,9 @@
 %%
 
 -module(rabbit_web_ocpp_handler).
+
+-feature(maybe_expr, enable).
+
 -behaviour(cowboy_websocket).
 -behaviour(cowboy_sub_protocol).
 

src/rabbit_web_ocpp_processor.erl

@@ -6,7 +6,8 @@
 %%
 -module(rabbit_web_ocpp_processor).
 
-%% Simplified exports for OCPP
+-feature(maybe_expr, enable).
+
 -export([info/2,
          init/7,
          process_incoming/2,