Package all natives in a single jar.

.github/workflows/build_publish.yaml

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+# This workflow compiles the native wasmer_jni lib into various OS and architectures using dynamic_libs_reusable.yaml.
+# Then it builds and publishes the JAR based on the GITHUB_REF that calls the workflow. There are 2 options:
+# 1. The workflow is executed from a branch. In that case the JAR is available in the GitHub action as an artifact.
+# 2. The workflow is executed from a tag. In that case the JAR is published in the corresponding GitHub release.
+name: Build and publish
+
+on:
+  push:
+    branches:
+      - '*'    # Trigger on push to any branch
+    tags:
+      - '*'    # Trigger on push to any tag
+
+jobs:
+  upload_dynamic_libs:
+    strategy:
+      matrix:
+        platform:
+          - os: 'macos-latest'
+            target: 'aarch64-apple-darwin'
+            artifact: 'darwin-arm64'
+            lib_name: 'libwasmer_jni.dylib'
+
+          - os: 'macos-latest'
+            target: 'x86_64-apple-darwin'
+            artifact: 'darwin-amd64'
+            lib_name: 'libwasmer_jni.dylib'
+
+          - os: 'ubuntu-latest'
+            target: 'x86_64-unknown-linux-gnu'
+            artifact: 'linux-amd64'
+            lib_name: 'libwasmer_jni.so'
+
+          - os: 'windows-latest'
+            target: 'x86_64-pc-windows-msvc'
+            artifact: 'win32-amd64'
+            lib_name: 'wasmer_jni.dll'
+    uses: ./.github/workflows/dynamic_libs_reusable.yaml
+    with:
+      platform_os: ${{ matrix.platform.os }}
+      platform_target: ${{ matrix.platform.target }}
+      platform_artifact: ${{ matrix.platform.artifact }}
+      platform_lib_name: ${{ matrix.platform.lib_name }}
+
+  publish_jar:
+    name: Publish the JARs
+    runs-on: ubuntu-latest
+    needs: [upload_dynamic_libs]
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Set up Java 21
+        uses: actions/setup-java@v1
+        with:
+          java-version: 21
+
+      - name: Set up Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          default: true
+          override: true
+
+      - name: Cache Cargo registry
+        uses: actions/cache@v1
+        with:
+          path: ~/.cargo/registry
+          key: cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache Cargo bin
+        uses: actions/cache@v1
+        with:
+          path: ~/.cargo/bin
+          key: cargo-bin-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache Cargo build
+        uses: actions/cache@v1
+        with:
+          path: target
+          key: cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Setup wasmer-jni artifacts dir
+        id: setip_dir
+        shell: bash
+        run: |
+          random_string=$(uuidgen)
+          mkdir $random_string
+          echo "EXT_ARTIFACTS_DIR=$random_string" >> $GITHUB_ENV
+
+      - name: Download wasmer_jni artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: ./${{ env.EXT_ARTIFACTS_DIR }}
+
+      - name: Display structure of downloaded files
+        run: ls -R ./$EXT_ARTIFACTS_DIR
+
+      - name: Run all the tests
+        shell: bash
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          make test
+
+      - name: Create the JAR
+        id: create_jar
+        shell: bash
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          make package
+
+      - name: Upload JAR as workflow artifact
+        if: startsWith(github.ref, 'refs/heads/')
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.create_jar.outputs.name }}
+          path: ${{ steps.create_jar.outputs.path }}
+          retention-days: 1
+
+      - name: Get release info
+        id: get_release_info
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: bruceadams/get-release@v1.3.2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload JAR as Github pre-release asset
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.get_release_info.outputs.upload_url }}
+          asset_path: ${{ steps.create_jar.outputs.path }}
+          asset_name: ${{ steps.create_jar.outputs.name }}
+          asset_content_type: application/java-archive

.github/workflows/dynamic_libs_reusable.yaml

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+# This workflow cross compiles a rust library into a native based on a provided target.
+# The compiled library is then uploaded as a GitHub artifact.
+name: upload_dynamic_libs
+
+on:
+  workflow_call:
+    inputs:
+      platform_os:
+        description: Operating system that the runner will use.
+        type: string
+        required: true
+      platform_target:
+        description: The architecture that rust will compile the libs for.
+        type: string
+        required: true
+      platform_artifact:
+        description: The name of the artifact that will be uploaded.
+        type: string
+        required: true
+      platform_lib_name:
+        description: Name of the native library to be uploaded in the artifact.
+        type: string
+        required: true
+
+
+jobs:
+  publish_dlibs:
+    name: Publish the dynamic libraries
+    runs-on: ${{ inputs.platform_os }}
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Set up Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          default: true
+          override: true
+
+      - name: Create the dynamic libs
+        shell: bash
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          rustup target add ${{ inputs.platform_target }}
+          cargo build --release --target=${{ inputs.platform_target }}
+
+      - name: Upload the dynamic libs
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ inputs.platform_artifact }}
+          path: ./target/${{ inputs.platform_target }}/release/${{ inputs.platform_lib_name }}
+          retention-days: 1