new file: docs/fluxcd.md

docs/fluxcd.md

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+# fluxcd
+
+## age / sops
+
+**Create key and Import:**
+
+``` bash
+NAMESPACE=ns-name
+AGE_FILE=deploy/flux/.env.d/age.agekey
+SECRET_NAME=flux-sops-age
+
+# creates age key
+age-keygen -o ${AGE_FILE}
+# imports to an namespace
+cat ${AGE_FILE} | 
+kubectl create secret generic ${SECRET_NAME} \
+--namespace=${NAMESPACE} \
+--from-file=age.agekey=/dev/stdin
+```