ci: allow publishing snapshots without a tag

The deploy workflow only ran on a `v*` tag, so there was no way to publish a
snapshot — and tagging one would say "release" about something that is not.

Adds `workflow_dispatch`, and a guard: a manual run refuses to proceed unless
the version ends in `-SNAPSHOT`, so releasing stays tied to a tag. The job now
also builds and tests before publishing, which it never did.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: 7agustibm

.github/workflows/deploy.yml

@@ -1,9 +1,12 @@
 name: Deploy to Reposilite
 
 on:
+  # Releases are cut from a tag.
   push:
     tags:
       - 'v*'
+  # Snapshots are published on demand from a branch, with no tag involved.
+  workflow_dispatch:
 
 jobs:
 
@@ -19,10 +22,25 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: '17'
+
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v4
 
-      - name: Publish to Reposilite
+      - name: Read version
+        id: version
+        run: echo "value=$(./gradlew -q printVersion)" >> "$GITHUB_OUTPUT"
+
+      # A manual run may only publish a snapshot; releasing is what the tag is for.
+      - name: Refuse to release without a tag
+        if: github.event_name == 'workflow_dispatch' && !endsWith(steps.version.outputs.value, '-SNAPSHOT')
+        run: |
+          echo "::error::Version ${{ steps.version.outputs.value }} is not a snapshot. Push a v* tag to release."
+          exit 1
+
+      - name: Build and test
+        run: ./gradlew build
+
+      - name: Publish ${{ steps.version.outputs.value }} to Reposilite
         env:
           MAVEN_NAME: '${{ secrets.MAVEN_NAME }}'
           MAVEN_TOKEN: '${{ secrets.MAVEN_TOKEN }}'

build.gradle.kts

@@ -128,3 +128,9 @@ tasks.jar {
         attributes("Automatic-Module-Name" to "io.javalin.community.graphql")
     }
 }
+
+// Used by the deploy workflow to tell a snapshot from a release before publishing.
+tasks.register("printVersion") {
+    val projectVersion = version.toString()
+    doLast { println(projectVersion) }
+}