bootc: add page and add Portuguese translation (#14917)

pages/linux/bootc.md

@@ -0,0 +1,25 @@
+# bootc
+
+> Boot and upgrade via container images.
+> Manages transactional, in-place operating system updates using OCI/Docker container images.
+> More information: <https://containers.github.io/bootc/>.
+
+- Show deployments in the order they will appear in the bootloader:
+
+`bootc status`
+
+- Check if any updates are available:
+
+`bootc upgrade --check`
+
+- Prepare a new update and reboot into it:
+
+`bootc upgrade --apply`
+
+- Change OS base to new container image:
+
+`bootc switch {{image}}`
+
+- Reboot into the previous ostree deployment:
+
+`bootc rollback`