In order to install these connectors to your environment, you will need sufficient permissions to create and publish custom connectors. A detailed overview of what custom connectors are, can be found at this link.
Access your environment by navigating to make.powerapps.com and logging in using your work or school account.
Once logged in, access the Custom Connectors area by expanding the Dataverse navigation group on the left hand pane and clicking on the Custom Connectors link
On the Custom Connectors page import the definition file by opening the New custom connector menu and selecting Import an OpenAPI file option.
In the dialog that opens, enter the name of the connector and select the appropriate *.swagger.json file from this repository.
Once imported, in the custom connector editor, select the appropriate icon and add a colour in hex format. For e.g. for the "Regular Expression" connector, use #e6f0ff as the Icon background color.
Switch to the Code (Preview) tab in the editor, and ensure that Code enabled is toggled to the On position.
Open the appropriate *.cs file from the connector folder in this repository and copy all the contents of the file into the code editor area in that page.
From the Operations drop down, select all the operations to ensure that the code is executed when the user adds any of the actions in the connector.
Click on Create Connector or Update Connector button on the toolbar and wait for Power Automate to complete the save. Once saved, you are free to use the connector in your Flows. You will typically find it in the Custom tab when adding an action.