vscode -- How to run `docker` in a task ? -- Docker-Build-Task does not work - docker

Question

Situation and Problem
I am running macOS Mojave 10.14.5, upgraded bash like described here and have a TeXlive docker container (basically that one), that I want to call to typeset LaTeX files. This does work very well and also execution with this following tasks.json worked flawlessly up unti some recent update (that I cannot pin down, as I am not using this daily).
tasks.json
{
// See https://go.microsoft.com/fwlink/?LinkId=733558
// for the documentation about the tasks.json format
"version": "2.0.0",
"tasks": [
{
"type": "shell",
"label": "runit",
"group": {
"kind": "build",
"isDefault": true
},
"command": "docker",
"args": [
"run",
"-v",
"${fileDirname}:/doc/",
"-t",
"-i",
"mytexlive",
"pdflatex",
"${fileBasename}"
],
"problemMatcher": []
},
{
"type": "shell",
"label": "test",
"command": "echo",
"args": [
"run",
"-v",
"${fileDirname}:/doc/",
"-t",
"-i",
"mytexlive",
"pdflatex",
"${fileBasename}"
],
}
]
}
Trying to run docker yields a "command not found" :
> Executing task: docker run -v /path/to/file:/doc/ -t -i mytexlive pdflatex file_name.tex <
/usr/local/bin/bash: docker: command not found
The terminal process command '/usr/local/bin/bash -c 'docker run -v /path/to/file:/doc/ -t -i mytexlive pdflatex file_name.tex'' failed to launch (exit code: 127)
... while trying to echo, works just fine.
> Executing task: echo run -v /path/to/file:/doc/ -t -i mytexlive pdflatex file_name.tex <
run -v /path/to/file:/doc/ -t -i mytexlive pdflatex file_name.tex
Even though, it once worked just like described above and the very same command works in the terminal, it fails now if I execute it as a build-task. Hence, my
Question
How to use docker in a build-task ?
or fix the problem in the above set up.
additional notes
Trying the following yielded the same "command not found"
{
"type": "shell", "label": "test",
"command": "which", "args": ["docker"]
}
... even though this works:
bash$ /usr/local/bin/bash -c 'which docker'
/usr/local/bin/docker
bash$ echo $PATH
/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
edit: One more note:
I am using a context entry to start vscode with an automator script that runs the following bash command with the element 'right-clicked' passed as the variable:
#!/bin/sh
/usr/local/bin/code -n "$1"

Answer 1

So since there hasn't been any progress here and I got help on GitHub: I will just answer myself such that others led here searching for a solution won't be let down.
Please give all the acknowledgement to joaomoreno for his answer here
Turns out that by starting vscode via a context-entry there is some issue with an enviroment variable. Starting like this fixed that problem thus far:
#!/bin/sh
VSCODE_FORCE_USER_ENV=1 /usr/local/bin/code -n "$1"