[bashrc][Windows] Multiple errors when spawning new git-bash session

[rucker]

awk: fatal: cannot open file `/proc/self/cgroup' for reading (No such file or directory)
which: no tmux in (/mingw64/bin:/usr/bin:/c/Users/rick/bin:/c/Python39/Scripts:/c/Python39:/c/ProgramData/Boxstarter:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0:/c/Windows/System32/OpenSSH:/c/ProgramData/chocolatey/bin:/cmd:/c/Program Files/Microsoft VS Code/bin:/c/ProgramData/nvm:/c/Program Files/nodejs:/c/Program Files (x86)/Olive/OliveScriptEngine:/c/tools/groovy-3.0.8/bin:/c/Program Files/OpenJDK/jdk-17/bin:/c/Program Files (x86)/Olive/OliveScript Engine/1.0.0:/c/Program Files (x86)/Olive/OliveScript Engine/0.12.0:/c/Program Files/dotnet:/c/Program Files (x86)/Olive/OliveScript Engine/0.0.0:/c/Users/rick/.windows-build-tools/python27:/c/Users/rick/.windows-build-tools/python27:/c/Users/rick/AppData/Local/Microsoft/WindowsApps:/c/Program Files (x86)/WiX Toolset v3.11/bin:/c/Users/rick/.dotnet/tools:/c/Program Files (x86)/Microsoft Visual Studio/2017/BuildTools/MSBuild/15.0/Bin:/c/Users/rick/.dotnet/tools)
awk: fatal: cannot open file `/proc/self/cgroup' for reading (No such file or directory)
dircolors: no SHELL environment variable, and no shell type option given
bash: command substitution: line 1: syntax error near unexpected token `)'
bash: command substitution: line 1: `__git_ps1)'