[DEV] Debug authelia when running a suite. (#1060)

* [DEV] Debug authelia when running a suite.

This runs dlv debugger within authelia backend container so that an IDE can remote
debug the application using port 2345.

* Apply suggestions from code review

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>

.gitignore

@@ -43,4 +43,6 @@ Configuration.schema.json
 
 qemu-*-static
 
-public_html.gen.go
+public_html.gen.go
+
+__debug_bin

internal/suites/example/compose/authelia/docker-compose.backend.dev.yml

@@ -7,8 +7,13 @@ services:
       args:
         USER_ID: ${USER_ID}
         GROUP_ID: ${GROUP_ID}
+    security_opt:
+      - seccomp:unconfined
+      - apparmor:unconfined
     command: /resources/entrypoint-backend.sh
     working_dir: /app
+    cap_add:
+      - SYS_PTRACE
     volumes:
       - './example/compose/authelia/resources/:/resources'
       - '../..:/app'

internal/suites/example/compose/authelia/resources/entrypoint-backend.sh

@@ -2,8 +2,14 @@
 
 set -x
 
+# We move out of the workspace to not include the modules as dependencies of the project.
+cd /
+
 echo "Use hot reloaded version of Authelia backend"
 go get github.com/cespare/reflex
+go get github.com/go-delve/delve/cmd/dlv
+
+cd /app
 
 # Sleep 10 seconds to wait the end of npm install updating web directory
 # and making reflex reload multiple times.

internal/suites/example/compose/authelia/resources/run-backend-dev.sh

@@ -2,10 +2,8 @@
 
 set -e
 
-# Build the binary
-go build -o /tmp/authelia/authelia-tmp cmd/authelia/*.go
 while true;
 do
-    /tmp/authelia/authelia-tmp --config /etc/authelia/configuration.yml
+    dlv --listen 0.0.0.0:2345 --headless=true --continue --accept-multiclient debug cmd/authelia/*.go -- --config /etc/authelia/configuration.yml
     sleep 10
 done