Update cheatsheets

jarsigner

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jarsigner
+
+> Sign and verify Java archive (JAR) files.
+> More information: <https://docs.oracle.com/en/java/javase/20/docs/specs/man/jarsigner.html>.
+
+- Sign a JAR file:
+
+`jarsigner {{path/to/file.jar}} {{keystore_alias}}`
+
+- Sign a JAR file with a specific algorithm:
+
+`jarsigner -sigalg {{algorithm}} {{path/to/file.jar}} {{keystore_alias}}`
+
+- Verify the signature of a JAR file:
+
+`jarsigner -verify {{path/to/file.jar}}`