Document publishing process (#535)

publishing/PUBLISHING.md

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+# Publishing lightning-kmp artifacts
+
+## snapshots
+
+Snapshots are published to the Sonatype snapshot repository (https://oss.sonatype.org/content/repositories/snapshots/).
+To publish snapshots, you must add your sonatype credentials for the `ossrh` server to your local maven settings (typically in $HOME/.m2/settings.xml)
+
+- Download `snapshot.zip` generated by the `Publish snapshot` github action
+- unzip `snapshot.zip` in the `publishing` directory
+- run `lightning-kmp-snapshot-deploy.sh`
+
+For example:
+
+```shell
+$ VERSION=1.2.3-SNAPSHOT ./lightning-kmp-snapshot-deploy.sh
+```
+
+## releases
+
+Releases are published to the Sonatype staging repository. If all items are valid they will be published to `maven central` repository.
+
+- Download `release.zip` generated by the `Publish release` github action (which is triggered every time you publish a github release)
+- unzip `release.zip` in the `publishing` directory
+- sign all artifacts with a valid gpg key: `find release -type f -print -exec gpg -ab {} \;`
+- run `lightning-kmp-staging-upload.sh`
+- log into sonatype, close and publish your staging repository. Artifacts will be available on Maven Central within a few hours.
+
+For example:
+
+```shell
+$ VERSION=1.2.3 OSS_USER=my_sonatype_username ./lightning-kmp-staging-upload.sh
+```

publishing/lightning-kmp-staging-upload.sh

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+#!/bin/bash -x
+#
+# first you must sign all files with something like:
+# find release -type f -print -exec gpg -ab {} \;
+#
+
+if [[ -z "${VERSION}" ]]; then
+  echo "VERSION is not defined"
+  exit 1
+fi
+
+if [[ -z "${OSS_USER}" ]]; then
+  echo "OSS_USER is not defined"
+  exit 1
+fi
+
+read -p "Password : " -s OSS_PASSWORD
+
+for i in 	lightning-kmp \
+		lightning-kmp-iosarm64 \
+		lightning-kmp-iosx64 \
+		lightning-kmp-jvm \
+		lightning-kmp-linux
+do
+	pushd .
+	cd release/fr/acinq/lightning/$i/$VERSION &&\
+	pwd &&\
+	jar -cvf bundle.jar *&&\
+	curl -v -XPOST -u $OSS_USER:$OSS_PASSWORD --upload-file bundle.jar https://oss.sonatype.org/service/local/staging/bundle_upload	
+  popd
+done