CI: migrate build pipeline on GitHub actions

.github/files/toolchains.xml

@@ -0,0 +1,53 @@
+<!--
+
+    Copyright 2012-2019 The Feign Authors
+
+    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 permissions and limitations under
+    the License.
+
+-->
+<toolchains>
+    <toolchain>
+        <type>jdk</type>
+        <provides>
+            <version>1.8</version>
+        </provides>
+        <configuration>
+            <jdkHome>/home/runner/.sdkman/candidates/java/8.0.382-tem</jdkHome>
+        </configuration>
+    </toolchain>
+    <toolchain>
+        <type>jdk</type>
+        <provides>
+            <version>11</version>
+        </provides>
+        <configuration>
+            <jdkHome>/home/runner/.sdkman/candidates/java/11.0.22-tem</jdkHome>
+        </configuration>
+    </toolchain>
+    <toolchain>
+        <type>jdk</type>
+        <provides>
+            <version>17</version>
+        </provides>
+        <configuration>
+            <jdkHome>/home/runner/.sdkman/candidates/java/17.0.10-tem</jdkHome>
+        </configuration>
+    </toolchain>
+    <toolchain>
+        <type>jdk</type>
+        <provides>
+            <version>21</version>
+        </provides>
+        <configuration>
+            <jdkHome>/home/runner/.sdkman/candidates/java/21.0.2-tem</jdkHome>
+        </configuration>
+    </toolchain>
+</toolchains>

.github/workflows/build.yml

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+#
+# Copyright 2012-2020 The Feign Authors
+#
+# 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 permissions and limitations under
+# the License.
+#
+name: Build
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'  # Runs on all new tags
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    env:
+      # Customize the JVM maximum heap limit
+      MAVEN_OPTS: -Xmx3200m
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+
+      - name: Cache local Maven repository
+        uses: actions/cache@v3
+        continue-on-error: true
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-maven-${{ matrix.language }} ${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-${{ matrix.language }}
+            ${{ runner.os }}-maven-
+
+      - name: Cache SDKMAN JDKs
+        uses: actions/cache@v4
+        with:
+          path: ~/.sdkman
+          key: sdkman-java-${{ runner.os }}-${{ hashFiles('~/.m2/toolchains.xml') }}
+          restore-keys: sdkman-java-${{ runner.os }}-
+
+      - name: Install SDKMAN!
+        run: |
+          if [ ! -d "$HOME/.sdkman" ]; then
+            curl -s "https://get.sdkman.io" | bash
+          fi
+          source "$HOME/.sdkman/bin/sdkman-init.sh"
+
+      - name: Install JDKs (8, 11, 17, 21)
+        run: |
+          source "$HOME/.sdkman/bin/sdkman-init.sh"
+          jdk_versions=("8.0.382-tem" "11.0.22-tem" "17.0.10-tem" "21.0.2-tem")
+          for jdk_version in "${jdk_versions[@]}"; do
+            if [ ! -d "$HOME/.sdkman/candidates/java/$jdk_version" ]; then
+              yes n | sdk install java "$jdk_version"
+            fi
+          done
+          sdk default java 21.0.2-tem
+
+      - name: Configure Maven Toolchain
+        run: |
+          mkdir -p ~/.m2
+          cp .github/files/toolchains.xml ~/.m2/toolchains.xml
+
+      - name: Download dependencies only
+        run: ./mvnw -ntp -B org.apache.maven.plugins:maven-dependency-plugin:3.8.1:go-offline de.qaware.maven:go-offline-maven-plugin:1.2.8:resolve-dependencies -fn
+
+      - name: Build
+        run: ./mvnw -ntp -B clean install
+
+      - name: Verify formatting
+        run: scripts/no-git-changes.sh
+
+      - name: Nexus deploy
+        if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/')
+        run: |
+          cp .github/files/settings.xml ~/.m2/settings.xml
+          echo -e "$GPG_KEY" | gpg --batch --no-tty --import --yes
+          ./mvnw -ntp -nsu -P release -pl -:feign-benchmark -DskipTests=true deploy