base: disable Zincati and pinger on non-release builds

On non-release/local developer builds, we don't want Zincati or pinger
to be active by default. Key off of the OSTree version and add a config
dropin to do this.

See discussions about this in:
coreos/fedora-coreos-tracker#212

fedora-coreos-base.yaml

@@ -123,6 +123,17 @@ postprocess:
     set -xeuo pipefail
     rm -rf /etc/systemd/system/*
     systemctl preset-all
+  # Disable Zincati and fedora-coreos-pinger on non-release builds
+  # https://github.com/coreos/fedora-coreos-tracker/issues/212
+  - |
+    #!/usr/bin/env bash
+    set -xeuo pipefail
+    source /etc/os-release
+    if [[ $OSTREE_VERSION = *.dev* ]]; then
+      mkdir -p /etc/fedora-coreos-pinger/config.d /etc/zincati/config.d
+      echo -e '# https://github.com/coreos/fedora-coreos-tracker/issues/212\nreporting.enabled = false' > /etc/fedora-coreos-pinger/config.d/95-disable-on-dev.toml
+      echo -e '# https://github.com/coreos/fedora-coreos-tracker/issues/212\nupdates.enabled = false' > /etc/zincati/config.d/95-disable-on-dev.toml
+    fi
 
 packages:
   # Security