backstage: [TechDocs] Docker build fails on k8s

Issue

Here is the error reported by backstage using TAP-GUI - https://docs.vmware.com/en/Tanzu-Application-Platform/1.0/tap/GUID-tap-gui-about.html

2022-03-03T14:32:58.733Z techdocs error Failed to build the docs page: Failed to generate docs from ${inputDir} into ${outputDir}; caused by Error: This operation requires Docker. Docker does not appear to be available. Docker.ping() failed with; caused by Error: connect ENOENT /var/run/docker.sock Failed to generate docs from ${inputDir} into ${outputDir}; caused by Error: This operation requires Docker. Docker does not appear to be available. Docker.ping() failed with; caused by Error: connect ENOENT /var/run/docker.sock type=plugin name=Error cause=Error: This operation requires Docker. Docker does not appear to be available. Docker.ping() failed with; caused by Error: connect ENOENT /var/run/docker.sock stack=Error: Failed to generate docs from ${inputDir} into ${outputDir}; caused by Error: This operation requires Docker. Docker does not appear to be available. Docker.ping() failed with; caused by Error: connect ENOENT /var/run/docker.sock
    at _TechdocsGenerator.run (/app/node_modules/@backstage/techdocs-common/dist/index.cjs.js:312:13)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async DocsBuilder.build (/app/node_modules/@backstage/plugin-techdocs-backend/dist/index.cjs.js:136:5)
    at async DocsSynchronizer.doSync (/app/node_modules/@backstage/plugin-techdocs-backend/dist/index.cjs.js:214:23)
    at async /app/node_modules/@backstage/plugin-techdocs-backend/dist/index.cjs.js:305:7

The user will see using the UI the following error message