Fix build.sh on macOS and move the Docker image to gcc-15

.gitignore

@@ -3,8 +3,7 @@
 .vscode/
 CMakeUserPresets.json
 cmake-build/
-cmake-build-debug/
-cmake-build-release/
+cmake-build-*/
 conan_provider.cmake
 spectator/valid_chars.inc
 venv/

Dockerfiles/Ubuntu.Dockerfile

@@ -1,21 +1,26 @@
 # Use the official Ubuntu base image from Docker Hub
 FROM ubuntu:latest
 
-# Add a few required packages for building and developer tools
-RUN apt-get update && apt-get install -y \
+# Add a few required packages for building and developer tools. build.sh requires gcc-15, which comes from the same
+# toolchain PPA that CI uses.
+RUN apt-get update && apt-get install -y software-properties-common \
+    && add-apt-repository -y ppa:ubuntu-toolchain-r/test \
+    && apt-get update && apt-get install -y \
     vim \
     git \
     python3 \
     python3-venv \
-    gcc-13\
-    g++-13 \
+    gcc-15 \
+    g++-15 \
+    binutils-dev \
+    libiberty-dev \
     cmake \
     build-essential
 
 # Create a default working directory
 WORKDIR /home/ubuntu/spectator-cpp
 
-# Copy all files & folders in the projects root directory 
+# Copy all files & folders in the projects root directory
 # Exclude files listed in the dockerignore file
 COPY ../ /home/ubuntu/spectator-cpp
 

Dockerfiles/Ubuntu.Dockerfile.dockerignore

@@ -1,2 +1,3 @@
-# Ignore copying the default build folder if it exists
-cmake-build/
+# Ignore copying the build folders and the host's virtual environment, which the image rebuilds for Linux
+cmake-build*/
+venv/

build.sh

@@ -50,12 +50,15 @@ if [[ ! -f "$HOME/.conan2/profiles/default" ]]; then
   conan profile detect
 fi
 
-## Modify the default profile to set the compiler version and C++ standard
+## Modify the default profile to set the C++ standard, and on Linux the compiler version. On macOS, `conan profile detect`
+## records the Apple clang version itself.
 DEFAULT_PROFILE="$HOME/.conan2/profiles/default"
-sed -i.bak -E \
-  -e 's/^compiler\.version=.*/compiler.version=15.2/' \
-  -e 's/^compiler\.cppstd=.*/compiler.cppstd=23/' \
-  "$DEFAULT_PROFILE"
+PROFILE_EDITS=(-e 's/^compiler\.cppstd=.*/compiler.cppstd=23/')
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+  # The build requires gcc-15 (checked above), and Conan accepts the major version for gcc.
+  PROFILE_EDITS+=(-e 's/^compiler\.version=.*/compiler.version=15/')
+fi
+sed -i.bak -E "${PROFILE_EDITS[@]}" "$DEFAULT_PROFILE"
 rm -f "$DEFAULT_PROFILE.bak"
 
 if [[ ! -d $BUILD_DIR ]]; then