Add GitHub Action to build binary packages

Publish DEB and RPM packages as well as binary installers for each
commit that modifies source code.  This allows for testing development
code, and makes sure that problems with building binary packages are
noticed early on.

.github/workflows/packages.yml

@@ -0,0 +1,68 @@
+name: Publish binary packages
+
+on:
+  push:
+    paths-ignore:
+    - '.devcontainer/**'
+    - 'examples/**'
+    - 'lib/**'
+    - 'man/**'
+    - 'priv/**'
+    - '**.md'
+  pull_request:
+    paths-ignore:
+    - '.devcontainer/**'
+    - 'examples/**'
+    - 'lib/**'
+    - 'man/**'
+    - 'priv/**'
+    - '**.md'
+
+jobs:
+  binaries:
+    name: Binaries
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cache build directory
+        uses: actions/cache@v2
+        with:
+          path: ~/build/
+          key: ${{runner.os}}-ct-ng-1.24.0
+      - name: Install prerequisites
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get -qq install makeself
+          # https://github.com/crosstool-ng/crosstool-ng/blob/master/testing/docker/ubuntu21.10/Dockerfile
+          sudo apt-get -qq install build-essential autoconf bison flex gawk
+          sudo apt-get -qq install help2man libncurses5-dev libtool libtool-bin
+          sudo apt-get -qq install python3-dev texinfo unzip
+      - name: Install FPM
+        run: |
+          gem install --no-document --user-install fpm
+          echo $HOME/.gem/ruby/*/bin >> $GITHUB_PATH
+      - name: Check out repository code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Build binary archives
+        run: CHECK_DEPS=false tools/make-binaries
+      - name: Build DEB and RPM packages
+        run: tools/make-packages
+      - name: Build installers
+        run: tools/make-installers
+      - name: Collect packages
+        run: |
+          mkdir ejabberd-packages
+          mv ejabberd_*.deb ejabberd-*.rpm ejabberd-*.run ejabberd-packages
+      - name: Upload packages
+        uses: actions/upload-artifact@v3
+        with:
+          name: ejabberd-packages
+          #
+          # Appending the wildcard character ("*") is a trick to make
+          # "ejabberd-packages" the root directory of the uploaded ZIP file:
+          #
+          # https://github.com/actions/upload-artifact#upload-using-multiple-paths-and-exclusions
+          #
+          path: ejabberd-packages*
+          retention-days: 14