update PATH + improvements

Dockerfile

@@ -7,7 +7,7 @@ RUN apt update && \
     apt upgrade -y
 
 # Install some dependencies
-RUN apt install -y iputils nano gcc glibc unzip build-essential curl
+RUN apt install -y nano gcc lsof unzip build-essential curl
 
 # Install NodeJS & npm
 RUN curl -sL https://deb.nodesource.com/setup_14.x | bash && \
@@ -17,8 +17,13 @@ RUN curl -sL https://deb.nodesource.com/setup_14.x | bash && \
     npm -v
 
 # Install Rust compilers + cargo
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh && \
-    rustc --version && \
+RUN curl https://sh.rustup.rs -sSf | bash -s -- -y && \
+    echo 'source $HOME/.cargo/env' >> $HOME/.bashrc && \
+    export PATH='$PATH:$HOME/.cargo/bin'
+
+# Fetch versions of rustc and cargo
+ENV PATH="/root/.cargo/bin:${PATH}"
+RUN rustc --version && \
     cargo version
 
 # Test if Cargo works properly by running a hello world program
@@ -28,8 +33,15 @@ RUN cargo new hello_world && \
 
 # Install latest version of Deno
 RUN curl -fsSL https://deno.land/x/install/install.sh | sh && \
-    deno upgrade && \
-    deno --version
+    echo 'export DENO_INSTALL="/root/.deno"' >> $HOME/.bashrc && \
+    export DENO_INSTALL="/root/.deno" && \
+    export PATH='$PATH:$DENO_INSTALL/bin'
+
+# Check deno version and upgrade to latest
+ENV PATH="/root/.deno/bin:${PATH}"
+RUN deno upgrade && \
+    deno --version && \
+    deno run https://deno.land/std/examples/welcome.ts
 
 EXPOSE 80/tcp
 EXPOSE 443/tcp