flatpak-builder: add page (#6089)

pages/linux/flatpak-builder.md

@@ -0,0 +1,24 @@
+# flatpak-builder
+
+> Help build application dependencies.
+> More information: <https://docs.flatpak.org/en/latest/flatpak-builder-command-reference.html>.
+
+- Build a Flatpak and export it to a new repository:
+
+`flatpak-builder {{path/to/build_directory}} {{path/to/manifest}}`
+
+- Build a Flatpak and export it to the specified repository:
+
+`flatpak-builder --repo={{repository_name}} {{path/to/build_directory}} {{path/to/manifest}}`
+
+- Build a Flatpak and install it locally:
+
+`flatpak-builder --install {{path/to/build_directory}} {{path/to/manifest}}`
+
+- Build and sign a Flatpak and export it to the specified repository:
+
+`flatpak-builder --gpg-sign={{key_id}} --repo={{repository_name}} {{path/to/manifest}}`
+
+- Run a shell inside of an application sandbox without installing it:
+
+`flatpak-builder --run {{path/to/build_directory}} {{path/to/manifest}} {{sh}}`