Add nix installation

Author: kuznetsss

docker/debian/Dockerfile

@@ -46,6 +46,7 @@ pkgs+=(binutils-gold)   # Required build tool.
 pkgs+=(curl)            # Dependency for tools requiring downloading data.
 pkgs+=(dpkg-dev)        # Required packaging tool.
 pkgs+=(debhelper)       # Required packaging tool.
+pkgs+=(xz-utils)        # Required to install nix
 pkgs+=(file)            # Required packaging tool.
 pkgs+=(git)             # Required build tool.
 pkgs+=(gpg)             # Dependency for tools requiring signing or encrypting/decrypting.
@@ -191,6 +192,14 @@ rm -rf ccache-${CCACHE_VERSION}
 ccache --version
 EOF
 
+# Install nix
+RUN <<EOF
+sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon
+
+# Verify the installation. Should be run from a new shell.
+bash -c 'nix --version'
+EOF
+
 # Set the Conan home directory, so the users of this image can find the default
 # profile.
 ENV HOME=/root

docker/rhel/Dockerfile

@@ -56,6 +56,8 @@ pkgs+=(rpm-build)         # Required packaging tool.
 pkgs+=(unzip)             # Dependency for tools requiring unzipping files.
 pkgs+=(vim)               # Text editor.
 pkgs+=(wget)              # Required build tool.
+pkgs+=(curl)              # Required to install nix
+pkgs+=(xz)                # Required to install nix
 dnf update -y
 dnf install -y --allowerasing --setopt=tsflags=nodocs "${pkgs[@]}"
 dnf clean -y all
@@ -306,6 +308,14 @@ rm -rf ccache-${CCACHE_VERSION}
 ccache --version
 EOF
 
+# Install nix
+RUN <<EOF
+sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon
+
+# Verify the installation. Should be run from a new shell.
+bash -c 'nix --version'
+EOF
+
 # Set the Conan home directory, so the users of this image can find the default
 # profile.
 ENV HOME=/root

docker/ubuntu/Dockerfile

@@ -29,6 +29,7 @@ pkgs+=(ca-certificates) # Enable TLS verification for HTTPS connections by provi
 pkgs+=(binutils-gold)   # Required build tool.
 pkgs+=(curl)            # Dependency for tools requiring downloading data.
 pkgs+=(dpkg-dev)        # Required packaging tool.
+pkgs+=(xz-utils)        # Required to install nix
 pkgs+=(file)            # Required packaging tool.
 pkgs+=(git)             # Required build tool.
 pkgs+=(gpg)             # Dependency for tools requiring signing or encrypting/decrypting.
@@ -164,6 +165,14 @@ rm -rf ccache-${CCACHE_VERSION}
 ccache --version
 EOF
 
+# Install nix
+RUN <<EOF
+sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon
+
+# Verify the installation. Should be run from a new shell.
+bash -c 'nix --version'
+EOF
+
 # Set the Conan home directory, so the users of this image can find the default
 # profile.
 ENV HOME=/root