fix: add missing YAML document start tags

kestra/docker/file-build.yaml

@@ -1,3 +1,4 @@
+---
 # Kestra Docker File Build Template
 # ---
 #

kestra/docker/git-build.yaml

@@ -1,3 +1,4 @@
+---
 # Kestra Docker Git Build Template
 # ---
 #

kestra/inputs.yaml

@@ -1,3 +1,4 @@
+---
 # Kestra Inputs Template
 # ---
 #

kestra/python/command.yaml

@@ -1,3 +1,4 @@
+---
 # Kestra Python Command Template
 # ---
 #

kestra/python/script.yaml

@@ -1,3 +1,4 @@
+---
 # Kestra Python Command Template
 # ---
 #

kestra/variables.yaml

@@ -1,3 +1,4 @@
+---
 # Kestra Variable Template
 # ---
 #

kestra/webhook.yaml

@@ -1,3 +1,4 @@
+---
 # Kestra Webhook Template
 # ---
 #