(maint) install libcurl4 pkgs on gh runners

The 'patron' gem requires us to install libcurl4 and
libcurl4-openssl-dev to build its native extensions. 'patron' is a
dependency of the module meta-gem.

Author: eputnam

.github/workflows/unit-test.yml

@@ -6,6 +6,11 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
+      - name: install libcurl & libcurl4-openssl-dev
+        description: these packages are required to build native extensions for the 'patron' gem
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libcurl4 libcurl4-openssl-dev
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6
@@ -23,6 +28,11 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
+      - name: install libcurl & libcurl4-openssl-dev
+        description: these packages are required to build native extensions for the 'patron' gem
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libcurl4 libcurl4-openssl-dev
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6
@@ -39,7 +49,9 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6
-          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          bundler-cache: false
+      - name: Run bundle install
+        run: bundle install
       - run: bundle exec rspec spec/run_cd4pe_job_spec.rb
   windows_tests:
     runs-on: windows-latest
@@ -48,5 +60,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.6
-          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          bundler-cache: false
+      - name: Run bundle install
+        run: bundle install
       - run: $env:RUN_WINDOWS_UNIT_TESTS = "true"; bundle exec rspec spec/run_cd4pe_job_spec.rb