add action for prune-github-workflow-runs

.gitignore

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+# Dependency directory
+node_modules
+
+# Rest pulled from https://github.com/github/gitignore/blob/master/Node.gitignore
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# OS metadata
+.DS_Store
+Thumbs.db
+
+# Ignore built ts files
+__tests__/runner/*
+
+# IDE files
+.idea
+.vscode
+*.code-workspace

prune-github-workflow-runs/.eslintignore

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+lib/
+dist/
+node_modules/
+coverage/

prune-github-workflow-runs/.node-version

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+20.6.0

prune-github-workflow-runs/.prettierignore

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+dist/
+node_modules/
+coverage/

prune-github-workflow-runs/action.yaml

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+name: "Prune Github Workflow Runs"
+description: "Delete obsolete runs of workflows that do not exist anymore in the given repo."
+
+inputs:
+  token:
+    description: GitHub access token
+    required: true
+  owner:
+    description: Repository owner
+    required: false
+    default: ${{ github.repository_owner }}
+  repo:
+    description: Repository name
+    required: false
+    default: ${{ github.event.repository.name }}
+  dry-run:
+    description: "Do not delete runs, just print them"
+    required: false
+    default: "false"
+runs:
+  using: node20
+  main: "dist/index.js"