Action doesn't fail on failure

[mdickinson]

The action doesn't seem to be reporting failure correctly on a failed install, so steps following this action will continue and a workflow using this action typically fails when it first tries to use EDM.

Here's the relevant portion of the raw log from a failed run:

2021-07-02T15:36:28.8207993Z ##[group]Run enthought/setup-edm-action@v1
2021-07-02T15:36:28.8208504Z with:
2021-07-02T15:36:28.8208850Z   edm-version: 3.2.4
2021-07-02T15:36:28.8209358Z   download-directory: ~/.cache/download
2021-07-02T15:36:28.8209819Z env:
2021-07-02T15:36:28.8210176Z   INSTALL_EDM_VERSION: 3.2.4
2021-07-02T15:36:28.8210605Z   CI_PYTHON_VERSION: py36
2021-07-02T15:36:28.8211027Z   CI_FAULTHANDLER: true
2021-07-02T15:36:28.8211463Z   PYTHONBUFFERED: 1
2021-07-02T15:36:28.8211872Z   QT_DEBUG_PLUGINS: 1
2021-07-02T15:36:28.8212223Z   CI_MODE: test
2021-07-02T15:36:28.8212578Z ##[endgroup]
2021-07-02T15:36:28.8559127Z Using directory for storing downloaded installer: /home/runner/.cache/download
2021-07-02T15:36:28.8617866Z [command]/bin/bash /home/runner/work/_actions/enthought/setup-edm-action/v1/dist/install-edm-linux.sh 3.2.4 /home/runner/.cache/download
2021-07-02T15:36:28.8773930Z   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
2021-07-02T15:36:28.8775308Z                                  Dload  Upload   Total   Spent    Left  Speed
2021-07-02T15:36:28.8775714Z 
2021-07-02T15:36:29.4750204Z   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
2021-07-02T15:36:29.4795427Z 100   243    0   243    0     0    406      0 --:--:-- --:--:-- --:--:--   406
2021-07-02T15:36:29.4796900Z /home/runner/.cache/download/edm_cli_3.2.4_linux_x86_64.sh: line 1: syntax error near unexpected token `newline'
2021-07-02T15:36:29.4798330Z /home/runner/.cache/download/edm_cli_3.2.4_linux_x86_64.sh: line 1: `<?xml version="1.0" encoding="UTF-8"?>'
2021-07-02T15:36:29.4829348Z (node:2401) UnhandledPromiseRejectionWarning: Error: The process '/bin/bash' failed with exit code 2
2021-07-02T15:36:29.4831564Z     at ExecState._setResult (/home/runner/work/_actions/enthought/setup-edm-action/v1/dist/index.js:1026:25)
2021-07-02T15:36:29.4833340Z     at ExecState.CheckComplete (/home/runner/work/_actions/enthought/setup-edm-action/v1/dist/index.js:1009:18)
2021-07-02T15:36:29.4834912Z     at ChildProcess.<anonymous> (/home/runner/work/_actions/enthought/setup-edm-action/v1/dist/index.js:903:27)
2021-07-02T15:36:29.4835963Z     at ChildProcess.emit (events.js:210:5)
2021-07-02T15:36:29.4836767Z     at maybeClose (internal/child_process.js:1021:16)
2021-07-02T15:36:29.4837726Z     at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
2021-07-02T15:36:29.4839533Z (node:2401) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
2021-07-02T15:36:29.4842597Z (node:2401) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
2021-07-02T15:36:29.4955214Z ##[group]Run sudo apt-get update
2021-07-02T15:36:29.4955789Z �[36;1msudo apt-get update�[0m
2021-07-02T15:36:29.4956294Z �[36;1msudo apt-get install libglu1-mesa�[0m
2021-07-02T15:36:29.4956889Z �[36;1msudo apt-get install libxkbcommon-x11-0�[0m
2021-07-02T15:36:29.4996524Z shell: /bin/bash --noprofile --norc -e -o pipefail {0}
2021-07-02T15:36:29.4997002Z env:
2021-07-02T15:36:29.4997382Z   INSTALL_EDM_VERSION: 3.2.4
2021-07-02T15:36:29.4997812Z   CI_PYTHON_VERSION: py36
2021-07-02T15:36:29.4998235Z   CI_FAULTHANDLER: true
2021-07-02T15:36:29.4998674Z   PYTHONBUFFERED: 1
2021-07-02T15:36:29.4999087Z   QT_DEBUG_PLUGINS: 1
2021-07-02T15:36:29.4999443Z   CI_MODE: test
2021-07-02T15:36:29.4999801Z ##[endgroup]