fix: setup.sh -> bin/thisepic.sh (#16)

### Briefly, what does this PR introduce?
This PR modifies all instances of setup.sh to bin/thisepic.sh

### What kind of change does this PR introduce?
- [x] Bug fix (issue #__)
- [ ] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [x] Tests for the changes have been added
- [x] Documentation has been added / updated
- [x] Changes have been communicated to collaborators

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
No.

### Does this PR change default behavior?
No.

README.md

@@ -54,7 +54,7 @@ The following parameters are supported:
  - `release`: EIC shell release you are targeting (e.g. `3.0-stable`)
  - `platform-release`: EIC shell platform release string you are targeting (e.g. `jug_xl:3.0-stable`)
  - `run`: They payload code you want to execute on top of the view
- - `setup`: Initialization/Setup script for a view that sets the environment (e.g. `/opt/detector/setup.sh`)
+ - `setup`: Initialization/Setup script for a view that sets the environment (e.g. `/opt/detector/epic-main/bin/thisepic.sh`)
  - `sandbox-path`: Path where the setup script for the custom view is location. By specifying this variable the auto-resolving of the view based on `release` and `platform` is disabled.
  - `network_types`: Network types to setup inside container. Defaults to `bridge` networking, but can be `none` to disable networking.
  - `apptainer_version`: Apptainer version to use. Defaults to `latest`, but can be any version such as `v1.1.3`.

action.yml

@@ -21,7 +21,7 @@ inputs:
     required: false
     default: ''
   setup:
-    description: 'Environment initialization bash script that is sourced (e.g. install/setup.sh)'
+    description: 'Environment initialization bash script that is sourced (e.g. install/bin/thisepic.sh)'
     required: false
     default: ''
   sandbox-path: