r/apache: Use variables for HTTPS cert/key content

Using files for certificates and private keys is less than ideal.
The only way to "share" a certificate between multiple hosts is with
symbolic links, which means the configuration policy has to be prepared
for each managed system.  As we're moving toward a much more dynamic
environment, this becomes problematic; the host-provisioner will never
be able to copy a certificate to a new host that was just created.
Further, I have never really liked the idea of storing certificates and
private keys in Git anyway, even if it is in a submodule with limited
access.

group_vars/wildcard-cert.yml

@@ -0,0 +1,21 @@
+apache_ssl_certificate_data: >-
+  {{
+  query(
+    "kubernetes.core.k8s",
+    kind="Secret",
+    namespace="default",
+    resource_name="pyrocufflink-cert"
+  )[0].data["tls.crt"]
+  | b64decode
+  }}
+
+apache_ssl_certificate_key_data: >-
+  {{
+  query(
+    "kubernetes.core.k8s",
+    kind="Secret",
+    namespace="default",
+    resource_name="pyrocufflink-cert"
+  )[0].data["tls.key"]
+  | b64decode
+  }}