Check nix after creating env variables

Author: kuznetsss

docker/debian/Dockerfile

@@ -193,22 +193,17 @@ ccache --version
 EOF
 
 # Install nix
-RUN <<EOF
-sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
-
-# Source the nix daemon script to make nix available in the current shell.
-. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
-
-# Verify the installation.
-nix --version
-EOF
+RUN sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
 
 # Add nix to PATH and set NIX environment variables so nix is available in all
 # shells including non-interactive shells (e.g., GitHub Actions).
 ENV PATH="/nix/var/nix/profiles/default/bin:${PATH}"
 ENV NIX_PROFILES="/nix/var/nix/profiles/default"
 ENV NIX_SSL_CERT_FILE="/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
 
+# Verify the nix installation.
+RUN nix --version
+
 # Set the Conan home directory, so the users of this image can find the default
 # profile.
 ENV HOME=/root

docker/rhel/Dockerfile

@@ -309,22 +309,17 @@ ccache --version
 EOF
 
 # Install nix
-RUN <<EOF
-sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
-
-# Source the nix daemon script to make nix available in the current shell.
-. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
-
-# Verify the installation.
-nix --version
-EOF
+RUN sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
 
 # Add nix to PATH and set NIX environment variables so nix is available in all
 # shells including non-interactive shells (e.g., GitHub Actions).
 ENV PATH="/nix/var/nix/profiles/default/bin:${PATH}"
 ENV NIX_PROFILES="/nix/var/nix/profiles/default"
 ENV NIX_SSL_CERT_FILE="/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
 
+# Verify the nix installation.
+RUN nix --version
+
 # Set the Conan home directory, so the users of this image can find the default
 # profile.
 ENV HOME=/root

docker/ubuntu/Dockerfile

@@ -166,22 +166,17 @@ ccache --version
 EOF
 
 # Install nix
-RUN <<EOF
-sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
-
-# Source the nix daemon script to make nix available in the current shell.
-. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
-
-# Verify the installation.
-nix --version
-EOF
+RUN sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
 
 # Add nix to PATH and set NIX environment variables so nix is available in all
 # shells including non-interactive shells (e.g., GitHub Actions).
 ENV PATH="/nix/var/nix/profiles/default/bin:${PATH}"
 ENV NIX_PROFILES="/nix/var/nix/profiles/default"
 ENV NIX_SSL_CERT_FILE="/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
 
+# Verify the nix installation.
+RUN nix --version
+
 # Set the Conan home directory, so the users of this image can find the default
 # profile.
 ENV HOME=/root
@@ -299,22 +294,17 @@ ccache --version
 EOF
 
 # Install nix
-RUN <<EOF
-sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
-
-# Source the nix daemon script to make nix available in the current shell.
-. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
-
-# Verify the installation.
-nix --version
-EOF
+RUN sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon --yes
 
 # Add nix to PATH and set NIX environment variables so nix is available in all
 # shells including non-interactive shells (e.g., GitHub Actions).
 ENV PATH="/nix/var/nix/profiles/default/bin:${PATH}"
 ENV NIX_PROFILES="/nix/var/nix/profiles/default"
 ENV NIX_SSL_CERT_FILE="/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"
 
+# Verify the nix installation.
+RUN nix --version
+
 # Set the Conan home directory, so the users of this image can find the default
 # profile.
 ENV HOME=/root
@@ -349,12 +339,3 @@ cd test && ./run.sh clang
 cd ..
 rm -rf test
 EOF
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