Add preformance testing via touchstone

.Rbuildignore

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 ^doc$
 ^\.cache$
 ^compile_commands\.json$
+^touchstone$

.github/workflows/touchstone-comment.yaml

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+name: Continuous Benchmarks (Comment)
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+on:
+  workflow_run:
+    workflows: ["Continuous Benchmarks (Receive)"]
+    types:
+      - completed
+
+jobs:
+  upload:
+    runs-on: ubuntu-latest
+    if: >
+      ${{ github.event.workflow_run.event == 'pull_request' }}
+    steps:
+      - uses: lorenzwalthert/touchstone/actions/comment@v1
+        with: 
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/touchstone-receive.yaml

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+name: Continuous Benchmarks (Receive)
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
+
+on: 
+  pull_request:
+
+jobs:
+  prepare:
+    runs-on: ubuntu-latest 
+    if:
+      true &&
+      (
+        github.event.comment.author_association == 'OWNER' ||
+        github.event.comment.author_association == 'MEMBER' ||
+        github.event.comment.author_association == 'COLLABORATOR' 
+      )
+    outputs:
+      config: ${{ steps.read_touchstone_config.outputs.config }}
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - id: read_touchstone_config
+        run: |
+          content=`cat ./touchstone/config.json`
+          # the following lines are only required for multi line json
+          content="${content//'%'/'%25'}"
+          content="${content//$'\n'/'%0A'}"
+          content="${content//$'\r'/'%0D'}"
+          # end of optional handling for multi line json
+          echo "::set-output name=config::$content"
+  build:
+    needs: prepare
+    runs-on: ${{ matrix.config.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - ${{ fromJson(needs.prepare.outputs.config) }}
+    env:
+      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
+      RSPM: ${{ matrix.config.rspm }}
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: lorenzwalthert/touchstone/actions/receive@v1
+        with:
+          cache-version: 1
+          benchmarking_repo: ${{ matrix.config.benchmarking_repo }}
+          benchmarking_ref: ${{ matrix.config.benchmarking_ref }}
+          benchmarking_path: ${{ matrix.config.benchmarking_path }} 
+          force_upstream: true

touchstone/.gitignore

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+*
+!script.R
+!config.json
+!.gitignore
+!header.R
+!footer.R

touchstone/config.json

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+{
+    "os": "ubuntu-22.04",
+    "r": "4.3.1",
+    "rspm": "https://packagemanager.rstudio.com/all/__linux__/jammy/latest",
+    // "benchmarking_repo": "lorenzwalthert/here",
+    // "benchmarking_ref": "ca9c8e69c727def88d8ba1c8b85b0e0bcea87b3f",
+    "benchmarking_path": "touchstone/sources/here",
+}

touchstone/footer.R

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+# You can modify the PR comment footer here. You can use github markdown e.g.
+# emojis like :tada:.
+# This file will be parsed and evaluate within the context of
+# `benchmark_analyze` and should return the comment text as the last value.
+# See `?touchstone::pr_comment`
+link <- "https://lorenzwalthert.github.io/touchstone/articles/inference.html"
+glue::glue(
+  "\nFurther explanation regarding interpretation and",
+  " methodology can be found in the [documentation]({link})."
+)

touchstone/header.R

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+# You can modify the PR comment header here. You can use github markdown e.g.
+# emojis like :tada:.
+# This file will be parsed and evaluate within the context of
+# `benchmark_analyze` and should return the comment text as the last value.
+# Available variables for glue substitution:
+# * ci: confidence interval
+# * branches: BASE and HEAD branches benchmarked against each other.
+# See `?touchstone::pr_comment`
+glue::glue(
+  "This is how benchmark results would change (along with a",
+  " {100 * ci}% confidence interval in relative change) if ",
+  "{system2('git', c('rev-parse', 'HEAD'), stdout = TRUE)} is merged into {branches[1]}:\n"
+)

touchstone/script.R

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+# see `help(run_script, package = 'touchstone')` on how to run this
+# interactively
+
+# TODO OPTIONAL Add directories you want to be available in this file or during the
+# benchmarks.
+# touchstone::pin_assets("some/dir")
+
+# installs branches to benchmark
+touchstone::branch_install()
+
+# benchmark a function call from your package (two calls per branch)
+touchstone::benchmark_run(
+  # expr_before_benchmark = source("dir/data.R"), #<-- TODO OTPIONAL setup before benchmark
+  runif_test = dqrng::dqrunif(1e6), #<- TODO put the call you want to benchmark here
+  n = 10
+)
+
+# benchmark a function call from your package (two calls per branch)
+touchstone::benchmark_run(
+  # expr_before_benchmark = source("dir/data.R"), #<-- TODO OTPIONAL setup before benchmark
+  rnorm_test = dqrng::dqrnorm(1e6), #<- TODO put the call you want to benchmark here
+  n = 10
+)
+
+# benchmark a function call from your package (two calls per branch)
+touchstone::benchmark_run(
+  # expr_before_benchmark = source("dir/data.R"), #<-- TODO OTPIONAL setup before benchmark
+  rexp_test = dqrng::dqrexp(1e6), #<- TODO put the call you want to benchmark here
+  n = 10
+)
+
+# TODO OPTIONAL benchmark any R expression (six calls per branch)
+# touchstone::benchmark_run(
+#   more = {
+#     if (TRUE) {
+#       y <- yourpkg::f2(x = 3)
+#     }
+#   }, #<- TODO put the call you want to benchmark here
+#   n = 6
+# )
+
+
+# create artifacts used downstream in the GitHub Action
+touchstone::benchmark_analyze()

vignettes/.gitignore

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 *.html
 *.R
+*_files