trust: add page (#7699)

pages/linux/trust.md

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+# trust
+
+> Tool for operating on the trust policy store.
+> More information: <https://manned.org/trust>.
+
+- List trust policy store items:
+
+`trust list`
+
+- List information about specific items in the trust policy store:
+
+`trust list --filter={{blocklist|ca-anchors|certificates|trust-policy}}`
+
+- Store a specific trust anchor in the trust policy store:
+
+`trust anchor {{path/to/certificate.crt}}`
+
+- Remove a specific anchor from the trust policy store:
+
+`trust anchor --remove {{path/to/certificate.crt}}`
+
+- Extract trust policy from the shared trust policy store:
+
+`trust extract --format=x509-directory --filter=ca-anchors {{path/to/directory}}`
+
+- Display help for a subcommand:
+
+`trust {{subcommand}} --help`