fix: add -SNAPSHOT suffix for snapshot CI publishing

- Move version to gradle.properties (0.1.2) as single source of truth
- Append -SNAPSHOT conditionally via -PsnapshotBuild property
- Pass -PsnapshotBuild in snapshot workflow

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jamesarich

.github/workflows/snapshot.yml

@@ -29,4 +29,4 @@ jobs:
           CENTRAL_PORTAL_PASSWORD: ${{ secrets.CENTRAL_PORTAL_PASSWORD }}
           ORG_GRADLE_PROJECT_signingKey: ${{ secrets.SIGNING_KEY }}
           ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.SIGNING_PASSWORD }}
-        run: ./gradlew :plugin:publishAllPublicationsToCentralSnapshots
+        run: ./gradlew :plugin:publishAllPublicationsToCentralSnapshots -PsnapshotBuild

gradle.properties

@@ -1,2 +1,3 @@
 org.gradle.jvmargs=-Xmx2g -Dfile.encoding=UTF-8
 org.gradle.parallel=true
+version=0.1.2

plugin/build.gradle.kts

@@ -24,7 +24,7 @@ plugins {
 }
 
 group = "org.meshtastic.flatpak"
-version = "0.1.1"
+if (project.hasProperty("snapshotBuild")) version = "$version-SNAPSHOT"
 
 java {
     toolchain {