Add a spellchecker tool to CI and fix all existing typos.

content/posts/.spelling

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+# markdown-spellcheck spelling configuration file
+# Format - lines beginning # are comments
+# global dictionary is at the start, file overrides afterwards
+# one word per line, to define a file override use ' - filename'
+# where filename is relative to this configuration file
+WIP
+envs
+anymore
+hostname
+hostnames
+Dockerfile
+helmfile
+k8s
+env
+dir
+dev'n'stages
+oi
+minio
+ArgoCD
+setups
+SRE
+autoscaler
+gitea
+vendoring
+cli
+vpa
+ok
+cmp
+config
+GitOps
+argo
+argocding
+cluster-1
+cluster-2
+cluster-3
+kubernetes
+argocd
+helmfiles
+plugin
+helmfile.yaml
+cleanup
+serie
+backend
+js
+frontend