[skip ci] add readme pyb

infrastructure/README.md

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+# Build images
+
+## Prerequisites
+
+See also https://pypi.org/project/ddadevops/
+
+```bash
+# Ensure that yout python3 version is at least Python 3.7!
+
+sudo apt install python3-pip
+pip3 install pip --upgrade --user
+pip3 install pybuilder ddadevops deprecation --user
+export PATH=$PATH:~/.local/bin
+
+#  terraform
+pip3 install dda-python-terraform --user
+
+# AwsMixin
+pip3 install boto3 --user
+
+# AwsMfaMixin
+pip3 install boto3 mfa --user
+```
+
+In folder "docker-backup" resp. "docker-nextcloud":
+
+```bash
+# step test is optional
+pyb image test publish
+```