Fix build in postbuild substitution

[allenporter]

Fixes #707

[github-actions]

--- tests/testdata/cluster/clusters/prod Kustomization: flux-system/flux-system ConfigMap: flux-system/cluster-config

+++ tests/testdata/cluster/clusters/prod Kustomization: flux-system/flux-system ConfigMap: flux-system/cluster-config

@@ -1,9 +1,11 @@

 ---
 apiVersion: v1
 data:
+  SECRET_DOMAIN: example.com
+  SECRET_DOMAIN2: other.com
   cluster_label: example-value
 kind: ConfigMap
 metadata:
   labels:
     kustomize.toolkit.fluxcd.io/name: flux-system
     kustomize.toolkit.fluxcd.io/namespace: flux-system
--- tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/example-com-staging

+++ tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/example-com-staging

@@ -0,0 +1,18 @@

+---
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  labels:
+    kustomize.toolkit.fluxcd.io/name: apps
+    kustomize.toolkit.fluxcd.io/namespace: flux-system
+  name: example-com-staging
+spec:
+  commonName: example.com
+  dnsNames:
+  - example.com
+  - '*.example.com'
+  issuerRef:
+    kind: ClusterIssuer
+    name: letsencrypt-staging
+  secretName: example-com-staging-tls
+
--- tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/other-com-staging

+++ tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/other-com-staging

@@ -0,0 +1,19 @@

+---
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  labels:
+    kustomize.toolkit.fluxcd.io/name: apps
+    kustomize.toolkit.fluxcd.io/namespace: flux-system
+  name: other-com-staging
+spec:
+  commonName: other.com
+  dnsNames:
+  - other.com
+  - '*.other.com'
+  - example-value
+  issuerRef:
+    kind: ClusterIssuer
+    name: letsencrypt-staging
+  secretName: other-com-staging-tls
+

[github-actions]

--- tests/testdata/cluster/clusters/prod Kustomization: flux-system/flux-system ConfigMap: flux-system/cluster-config

+++ tests/testdata/cluster/clusters/prod Kustomization: flux-system/flux-system ConfigMap: flux-system/cluster-config

@@ -1,9 +1,11 @@

 ---
 apiVersion: v1
 data:
+  SECRET_DOMAIN: example.com
+  SECRET_DOMAIN2: other.com
   cluster_label: example-value
 kind: ConfigMap
 metadata:
   labels:
     kustomize.toolkit.fluxcd.io/name: flux-system
     kustomize.toolkit.fluxcd.io/namespace: flux-system
--- tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/example-com-staging

+++ tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/example-com-staging

@@ -0,0 +1,18 @@

+---
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  labels:
+    kustomize.toolkit.fluxcd.io/name: apps
+    kustomize.toolkit.fluxcd.io/namespace: flux-system
+  name: example-com-staging
+spec:
+  commonName: example.com
+  dnsNames:
+  - example.com
+  - '*.example.com'
+  issuerRef:
+    kind: ClusterIssuer
+    name: letsencrypt-staging
+  secretName: example-com-staging-tls
+
--- tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/other-com-staging

+++ tests/testdata/cluster/apps/prod Kustomization: flux-system/apps Certificate: flux-system/other-com-staging

@@ -0,0 +1,19 @@

+---
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  labels:
+    kustomize.toolkit.fluxcd.io/name: apps
+    kustomize.toolkit.fluxcd.io/namespace: flux-system
+  name: other-com-staging
+spec:
+  commonName: other.com
+  dnsNames:
+  - other.com
+  - '*.other.com'
+  - example-value
+  issuerRef:
+    kind: ClusterIssuer
+    name: letsencrypt-staging
+  secretName: other-com-staging-tls
+

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.47368% with 4 lines in your changes missing coverage. Please review.

Project coverage is 93.45%. Comparing base (c71dbb0) to head (4234b28).

Files	Patch %	Lines
flux_local/git_repo.py	88.46%	3 Missing ⚠️
flux_local/kustomize.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #734      +/-   ##
==========================================
+ Coverage   93.43%   93.45%   +0.02%     
==========================================
  Files          20       20              
  Lines        2131     2154      +23     
==========================================
+ Hits         1991     2013      +22     
- Misses        140      141       +1     

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