Generate documentation from actions.yml

Right now the documentation of valid inputs (and outputs) seems to be
manually maintained inside the `README.md` with a reference to the
`actions.yml` file.

Since this can be rather tedious to maintain this commit now uses
[github-actions-docs][1] to automatically generate documentation.

[1]: https://www.npmjs.com/package/github-action-docs

package-lock.json

@@ -31,6 +31,7 @@
         "eslint-config-prettier": "^8.6.0",
         "eslint-plugin-jest": "^27.9.0",
         "eslint-plugin-node": "^11.1.0",
+        "github-action-docs": "^1.1.0",
         "jest": "^29.7.0",
         "jest-circus": "^29.7.0",
         "jest-each": "^29.7.0",
@@ -3427,6 +3428,43 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/github-action-docs": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/github-action-docs/-/github-action-docs-1.1.0.tgz",
+      "integrity": "sha512-oKnOL7LGygSTZ5tOuWV49HQU+Gu1BUxHEDXbbPD63czliFYi6XbHm6kf3nzgTUuOsGccOh2IqA3/1GA9wHmbIg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "commander": "^13.1.0",
+        "yaml": "^2.7.0"
+      },
+      "bin": {
+        "github-action-docs": "dist/bin.js"
+      }
+    },
+    "node_modules/github-action-docs/node_modules/commander": {
+      "version": "13.1.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-13.1.0.tgz",
+      "integrity": "sha512-/rFeCpNJQbhSZjGVwO9RFV3xPqbnERS8MmIQzCtD/zl6gpJuV/bMLuN92oG3F7d8oDEHHRrujSXNUr8fpjntKw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/github-action-docs/node_modules/yaml": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.7.0.tgz",
+      "integrity": "sha512-+hSoy/QHluxmC9kCIJyL/uyFmLmc+e5CFR5Wa+bpIhIj85LVb9ZH2nVnqrHoSvKogwODv0ClqZkmiSSaIH5LTA==",
+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "yaml": "bin.mjs"
+      },
+      "engines": {
+        "node": ">= 14"
+      }
+    },
     "node_modules/glob": {
       "version": "7.2.3",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",