Add workflow for updating runner deps (#638)

.github/workflows/update_deps.yml

@@ -0,0 +1,57 @@
+on: workflow_dispatch
+
+jobs:
+  install-packages:
+    runs-on: ${{ matrix.platform }}
+    env:
+      DEBIAN_FRONTEND: noninteractive
+    strategy:
+      # Failing fast breaks the Omnibus build cache because the job is
+      # interrupted abruptly, leaving behind index.lock files.
+      fail-fast: false
+      matrix:
+        platform:
+          # ARM-based
+          - amazonlinux2-arm64
+          - centos9-arm64
+          - debian10-arm64
+          - debian11-arm64
+          - fedora33-arm64
+          - fedora34-arm64
+          - fedora35-arm64
+          - ubuntu1804-arm64
+          - ubuntu2004-arm64
+
+          # x64-based
+          - amazonlinux2-x64
+          - centos7-x64
+          - centos8-x64
+          - centos9-x64
+          - debian10-x64
+          - debian11-x64
+          - fedora33-x64
+          - fedora34-x64
+          - fedora35-x64
+          - ubuntu1804-x64
+          - ubuntu2004-x64
+          - opensuse15-x64
+    steps:
+      - name: install llvm on suse-based
+        if: startsWith(matrix.platform, "opensuse")
+        run: |
+          zypper install -y -t llvm
+      - name: install llvm on redhat-based
+        if: >
+          startsWith(matrix.platform, "amazonlinux") ||
+          startsWith(matrix.platform, "centos") ||
+          startsWith(matrix.platform, "fedora") ||
+          startsWith(matrix.platform, "fedora")
+        run: |
+          yum install -y llvm
+      - name: install llvm on debian-based
+        if: >
+          startsWith(matrix.platform, "debian") ||
+          startsWith(matrix.platform, "ubuntu")
+        run: |
+          apt-get update
+          apt-get install -yq llvm