Working version.

Dockerfile

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+FROM node:latest
+COPY deploy.js .
+RUN npm install -g caprover
+CMD ["node", "deploy.js"]

README.md

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+# drone-caprover-deploy
+
+Drone plugin to deploy to a caprover app using a tar of the required files.
+
+**Note**: You must have a captain-definition file present in the root of your repository.
+
+## Configuration
+
+A sample configuration which includes all settings will look like this
+
+```yaml
+{
+	name: "deploy",
+	image: "drone-caprover-deploy",
+	settings: {
+		app_name: "core", # Required: Caprover application name
+		password: { # Required: Caprover root password
+			from_secret: "cap_password"
+		},
+		host: { # Required: Caprover url
+			from_secret: "cap_url"
+		},
+		tar_include: [  # Optional: Items to include in the tar file. Will zip the entire repo if not specified.
+			"file1",
+			"file2"
+		],
+		suffixes: { # Optional: If provided, when the current branch for the job matches some "branch_name" key, the "suffix field" will be appended to the "app_name" value. This is useful if you want to condense your repo deploys into a single CI step.
+			"branch_name": "suffix field",
+			"develop": "-staging",
+			...
+		},
+	},
+	when: {
+		status: [
+			"success"
+		],
+		...
+	}
+}
+```
+
+What the above example will do:
+
+- Build a tar file which contains 'file1' and 'file2'
+- Once built, will deploy to the host specified in the 'cap_url' secret using the 'cap_password' secret.
+- When running on branch 'develop' it will deploy to the 'core-staging' application.

deploy.js

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+const { execSync } = require("child_process");
+
+const isNotValidString = str => !(typeof str === "string" && str.length > 1);
+
+let APP_NAME = process.env.PLUGIN_APP_NAME;
+const CAP_PASSWORD = process.env.PLUGIN_PASSWORD;
+const CAP_HOST = process.env.PLUGIN_HOST;
+
+const INCLUDE_FILES = process.env.PLUGIN_TAR_INCLUDE
+	? process.env.PLUGIN_TAR_INCLUDE.split(",").join(" ")
+	: ".";
+
+const SUFFIXES = process.env.PLUGIN_SUFFIXES
+	? JSON.parse(process.env.PLUGIN_SUFFIXES)
+	: "";
+
+const DRONE_BRANCH = process.env.DRONE_BRANCH;
+
+if (
+	isNotValidString(APP_NAME) ||
+	isNotValidString(CAP_PASSWORD || isNotValidString(CAP_HOST))
+) {
+	console.error("Invalid usage. Please check documentation");
+	process.exit(1);
+}
+
+if (SUFFIXES !== "") {
+	APP_NAME = APP_NAME + SUFFIXES[DRONE_BRANCH];
+}
+
+execSync(`tar -cf app.tar ${INCLUDE_FILES}`);
+
+execSync(
+	`caprover deploy --caproverUrl ${CAP_HOST} --capPassword ${CAP_PASSWORD} --caproverApp ${APP_NAME} --tarFile app.tar`,
+);