Merge pull request #1 from OpenAxon/init-build-workflow

chore (build.yml): initialize build workflow

.github/PULL_REQUEST_TEMPLATE.md

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+### What this PR does / why we need it
+
+### Which issue this PR fixes
+
+*(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*
+
+- fixes #
+
+### Checklist
+<!-- [Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.] -->
+- [ ] README.md was updated
+- [ ] Git commits were signed

.github/workflows/build.yml

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+---
+name: "Build"
+
+on:
+  push:
+    branches: ["master"]
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: ["7", "bionic", "focal"]
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v3"
+      - name: "Build for ${{ matrix.os }}"
+        run: |
+          export OS_VERSION=${{ matrix.os }}
+          make package
+      - name: Upload math result for job 1
+        uses: actions/upload-artifact@v3
+        with:
+          name: pkg
+          path: omnibus/pkg/*
+  list-packages:
+    needs: build
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: Download packages from build job
+        uses: actions/download-artifact@v3
+        with:
+          name: pkg
+      - name: List packages
+        shell: bash
+        run: |
+          ls