Added install of required build tools and external libraries

Also, updated python/python3 package name in docs.

Author: stemann

.devcontainer/Dockerfile

@@ -2,11 +2,23 @@ FROM mcr.microsoft.com/devcontainers/cpp:1-debian
 
 RUN <<EOT
 apt-get update
+# Install required build tools and external libraries
+apt-get --yes install --no-install-recommends \
+    build-essential \
+    cmake \
+    curl \
+    gfortran \
+    git \
+    libatomic1 \
+    m4 \
+    perl \
+    pkg-config \
+    python3 \
+    wget
+# Install additional packages
 apt-get --yes install --no-install-recommends \
     ccache \
     clang \
-    clang-format \
-    gfortran \
-    m4
+    clang-format
 rm -rf /var/lib/apt/lists/*
 EOT

doc/src/devdocs/build/build.md

@@ -178,7 +178,7 @@ Building Julia requires that the following software be installed:
 
 On Debian-based distributions (e.g. Ubuntu), you can easily install them with `apt-get`:
 ```
-sudo apt-get install build-essential libatomic1 python gfortran perl wget m4 cmake pkg-config curl
+sudo apt-get install build-essential libatomic1 python3 gfortran perl wget m4 cmake pkg-config curl
 ```
 
 On Red Hat-based distributions (e.g. Fedora, CentOS), you can install them with `yum`: