add basic CI Benchmarking

.github/workflows/benchmark.yml

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+name: Run benchmarks
+
+on:
+  pull_request:
+
+jobs:
+  Benchmark:
+    if: "!contains(github.event.head_commit.message, '[skip ci]')"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: 1
+
+      ## Setup
+      - name: Default TESTCMD
+        run: echo "TESTCMD=julia" >> $GITHUB_ENV
+      - name: Ubuntu TESTCMD
+        if: startsWith(matrix.os,'ubuntu')
+        run: echo "TESTCMD=xvfb-run --auto-servernum julia" >> $GITHUB_ENV
+      - name: Install Plots dependencies
+        uses: julia-actions/julia-buildpkg@latest
+      - name: Install Benchmarking dependencies
+        run: julia -e 'using Pkg; pkg"add PkgBenchmark BenchmarkCI@0.1"'
+
+      - name: Run benchmarks
+        run: $TESTCMD -e 'using BenchmarkCI; BenchmarkCI.judge()'
+      - name: Post results
+        run: julia -e 'using BenchmarkCI; BenchmarkCI.postjudge()'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

benchmark/benchmarks.jl

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+using BenchmarkTools
+
+const SUITE = BenchmarkGroup()
+
+# numbered to enforce sequence
+SUITE["1_load"] = @benchmarkable @eval(using Plots)
+SUITE["2_plot"] = @benchmarkable p = plot(1:0.1:10, sin.(1:0.1:10))
+SUITE["3_display"] = @benchmarkable display(p) setup=(p = plot(1:0.1:10, sin.(1:0.1:10)))