Deploy SNAPSHOTs via GitHub Actions.

.github/maven-settings.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright 2018-2021 Volkan Yazıcı
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permits and
+ limitations under the License.
+-->
+<settings xmlns="http://maven.apache.org/SETTINGS/1.1.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd">
+    <servers>
+        <server>
+            <id>sonatype-nexus-snapshots</id>
+            <username>${env.NEXUS_USER}</username>
+            <password>${env.NEXUS_PASS}</password>
+        </server>
+        <server>
+            <id>sonatype-nexus-staging</id>
+            <username>${env.NEXUS_USER}</username>
+            <password>${env.NEXUS_PASS}</password>
+        </server>
+        <server>
+            <id>gpg.passphrase</id>
+            <passphrase>${env.GPG_PKEY_PASS}</passphrase>
+        </server>
+    </servers>
+    <profiles>
+        <profile>
+            <id>nexus</id>
+            <activation>
+                <activeByDefault/>
+            </activation>
+            <properties>
+                <gpg.keyname>${env.GPG_PKEY_ID}</gpg.keyname>
+                <gpg.passphrase>${env.GPG_PKEY_PASS}</gpg.passphrase>
+            </properties>
+        </profile>
+    </profiles>
+</settings>

.github/workflows/maven.yml

@@ -17,6 +17,7 @@ name: CI
 on: [push]
 
 jobs:
+
   build:
 
     runs-on: ${{ matrix.os }}
@@ -35,10 +36,9 @@ jobs:
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-          restore-keys: |
-            ${{ runner.os }}-maven-
+          restore-keys: ${{ runner.os }}-maven-
 
-      - name: Set up JDK 8
+      - name: Setup JDK 8
         uses: actions/setup-java@v2.1.0
         with:
           distribution: 'adopt'
@@ -54,3 +54,41 @@ jobs:
         # pwsh (the default shell on Windows) hijacks "exec" keyword
         shell: bash
         run: ./mvnw -V -B --no-transfer-progress -e "-DtrimStackTrace=false" exec:java -Dexec.classpathScope=test -Dexec.mainClass=com.vlkan.rfos.SchedulerShutdownTestApp
+
+  deploy-snapshot:
+
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup Maven caching
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-maven-
+
+      - name: Setup JDK 8
+        uses: actions/setup-java@v2.1.0
+        with:
+          distribution: adopt
+          java-version: 8
+          java-package: jdk
+          architecture: x64
+
+      - name: Import GPG private key
+        run: echo -n "$GPG_PKEY" | base64 --decode | gpg -v --batch --import --yes --pinentry-mode error
+        env:
+          GPG_PKEY: ${{ secrets.GPG_PKEY }}
+
+      - name: Deploy
+        run: ./mvnw -DskipTests=true -DperformRelease=true --settings .github/maven-settings.xml verify gpg:sign install:install deploy:deploy
+        env:
+          GPG_PKEY_ID: ${{ secrets.GPG_PKEY_ID }}
+          GPG_PKEY_PASS: ${{ secrets.GPG_PKEY_PASS }}
+          NEXUS_USER: ${{ secrets.NEXUS_USER }}
+          NEXUS_PASS: ${{ secrets.NEXUS_PASS }}

pom.xml

@@ -244,6 +244,9 @@
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-gpg-plugin</artifactId>
                         <version>${maven-gpg-plugin.version}</version>
+                        <configuration>
+                            <useAgent>false</useAgent>
+                        </configuration>
                         <executions>
                             <execution>
                                 <id>sign-artifacts</id>