Restart systemd service on file change?

I'm new to systemd and would like to know what is the best strategy for restarting my web application whenever I deploy new version.

Currently I start my service on boot and it just sits there, however I would like it to restart automatically whenever I change the files since whenever I push to master on gitlab the runner gets the files, compiles and copies it to correct directory. Then I want to restart it or close it however I don't know how since to restart it requires sudo.

Here is my service file

[Unit]
After=mongod.service

[Service]
WorkingDirectory=/var/app/mywebsite/Web
Environment="HOME=/home/stan"
Environment="DOTNET_CLI_TELEMETRY_OPTOUT=1"
Environment="DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1"
ExecStart=/usr/bin/dotnet run -c Release -p /var/app/mywebsite/Web/project.json

[Install]
WantedBy=multi-user.target

Here is my ci file to be more specific

before_script:
    - set DOTNET_CLI_TELEMETRY_OPTOUT=1
    - set DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
    - set HOME=/home/stan
    - cd Web
    - dotnet restore
    - dotnet build -c Release
    - cd ..
copy:
    script:
        - cp -R ./* /var/app/mywebsite/ # After this I would like to restart the website service

If you mean to reload systemd, scanning for new or changed units then add:

sudo systemctl daemon-reload

1. open sudo visudo
2. add gitlab-runner ALL=(ALL) NOPASSWD: /bin/systemctl restart myapp
3. now you can do sudo /bin/systemctl restart myapp and it will not prompt for password