switch devcontainer image to ubuntu

.devcontainer/Dockerfile

@@ -1,10 +1,22 @@
-FROM mcr.microsoft.com/vscode/devcontainers/base:alpine
+FROM mcr.microsoft.com/vscode/devcontainers/base:ubuntu
 
-RUN apk add --no-cache \
-    clang \
-    clang-extra-tools \
+RUN apt-get update \
+    && apt-get install -y --no-install-suggests --no-install-recommends \
+        lsb-release wget software-properties-common gnupg \
+    && wget https://apt.llvm.org/llvm.sh \
+    && chmod +x llvm.sh \
+    && ./llvm.sh 18 \
+;
+
+RUN add-apt-repository -y ppa:mosquitto-dev/mosquitto-ppa \
+    && apt-get update \
+    && apt install -y --no-install-suggests --no-install-recommends \
+        libmosquitto-dev \
+        mosquitto-dev \
+;
+
+RUN apt-get update && apt-get install -y --no-install-suggests --no-install-recommends \
     git \
-    mariadb-dev \
-    mosquitto-dev \
-    sqlite-dev \
+    libmariadb-dev \
+    libsqlite-dev \
 ;

src/Makefile

@@ -1,5 +1,5 @@
-CC = /usr/bin/clang
-CXX = /usr/bin/clang++
+CC = /usr/bin/clang-18
+CXX = /usr/bin/clang++-18
 
 CXXFLAGS = -fPIC --std=c++23