Created Environment Variables (markdown)

Environment-Variables.md

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+(Prerelease Wiki for 1.9.0)
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+
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+### UPTIME_KUMA_SSL_CERT `string`
+- SSL Cert File Path
+- Default Value: `undefined`
+
+### UPTIME_KUMA_SSL_KEY `string`
+- SSL Key File Path
+- Default Value: `undefined`