Add fs-squash.md

docs/linux/fs-squash.md

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+
+# Squash
+
+## Gensquashfs
+
+```bash
+gensquashfs -f -F ./list-file -c xz -X dictsize=1048576 level=9 -b 1048576 /tmp/output.sqfs
+```
+
+### Where in list-file
+```
+# comment
+
+dir sqfs/path 0755 999 999
+
+file sqfs/path/file 0644 uid git /real/path/to/file
+```
+
+## Mksquashfs
+
+```bash
+mksquashfs ./ ../output.sqfs -comp xz -Xdict-size 100% -b 1048576 -force-uid 0 -force-gid 0
+```