preparing mardown file handling in Dockerfiles + refactoring build directory

.ci/gotenberg.yml

@@ -0,0 +1,25 @@
+# The port the application will listen to.
+port: 3000
+
+logs:
+  # Accepted values, in order of severity: DEBUG, INFO, WARN, ERROR, FATAL, PANIC.
+  # Messages at and above the selected level will be logged.
+  level: "DEBUG"
+
+  # Accepted values: text, json.
+  # When a TTY is not attached, the output will be in the defined format.
+  format: "text"
+
+commands:
+
+  html:
+    timeout: 30
+    template: "xvfb-run -e /dev/stdout wkhtmltopdf {{ .FilePath }} {{ .ResultFilePath }}"
+
+  office:
+    timeout: 30
+    template: "unoconv --format pdf --output \"{{ .ResultFilePath }}\" \"{{ .FilePath }}\""
+
+  merge:
+    timeout: 30
+    template: "pdftk {{ range $filePath := .FilesPaths }} {{ $filePath }} {{ end }} cat output {{ .ResultFilePath }}"