Initialize ChuBlog backend with SSH Git publishing

.env.example

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+PUBLIC_ORIGIN=https://blog.example.com
+SITE_ADDRESS=blog.example.com
+ADMIN_USERNAME=admin
+# Generate with chublog-api hash-password; keep single quotes around the hash.
+ADMIN_PASSWORD_HASH='$argon2id$REPLACE_WITH_GENERATED_HASH'
+ALLOW_REGISTRATION=true
+CHUSQL_ROOT_PASSWORD=replace-with-random-root-password-at-least-16-characters
+CHUSQL_PASSWORD=replace-with-different-random-index-password-at-least-16-characters
+SSH_PORT=2222
+HTTP_PORT=80
+HTTPS_PORT=443