Fix golang in Dockerfile, update min Go version

Ubuntu 23.04 is earliest one with golang 1.19+ in its repositories.
Ubuntu 23.04 requires running python in virtual env.

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:23.04
 SHELL ["/bin/bash", "-c"]
 
 ARG TZ="UTC"
@@ -12,12 +12,18 @@ ADD . .
 RUN if [ -z "$(ls plugins/stockpile)" ]; then echo "stockpile plugin not downloaded - please ensure you recursively cloned the caldera git repository and try again."; exit 1; fi
 
 RUN apt-get update && \
-    apt-get -y install python3 python3-pip git curl golang-go
+    apt-get -y install python3 python3-pip python3-venv git curl golang-go
+
 
 #WIN_BUILD is used to enable windows build in sandcat plugin
 ARG WIN_BUILD=false
 RUN if [ "$WIN_BUILD" = "true" ] ; then apt-get -y install mingw-w64; fi
 
+# Set up python virtualenv
+ENV VIRTUAL_ENV=/opt/venv/caldera
+RUN python3 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
 # Install pip requirements
 RUN pip3 install --no-cache-dir -r requirements.txt
 
@@ -26,6 +32,11 @@ RUN python3 -c "import app; import app.utility.config_generator; app.utility.con
     sed -i '/\- atomic/d' conf/local.yml;
 
 # Compile default sandcat agent binaries, which will download basic golang dependencies.
+
+# Install Go dependencies
+WORKDIR /usr/src/app/plugins/sandcat/gocat
+RUN go mod tidy && go mod download
+
 WORKDIR /usr/src/app/plugins/sandcat
 
 # Fix line ending error that can be caused by cloning the project in a Windows environment

README.md

@@ -80,7 +80,7 @@ Next, install the PIP requirements:
 ```Bash
 pip3 install -r requirements.txt
 ```
-**Super-power your Caldera server installation! [Install GoLang (1.17+)](https://go.dev/doc/install)**
+**Super-power your Caldera server installation! [Install GoLang (1.19+)](https://go.dev/doc/install)**
 
 Finally, start the server.
 ```Bash

conf/default.yml

@@ -45,7 +45,7 @@ requirements:
   go:
     command: go version
     type: installed_program
-    version: 1.11
+    version: 1.19
   python:
     attr: version
     module: sys