Merge #1564: ci: add cron-update-rust.yml

b92f8c9 ci: add cron-update-rust.yml (valued mammal)

Pull request description:

  This adds a cronjob to watch for updates to rust stable once a month. If the latest version changed, then a pull request is opened to see if clippy passes CI using the new toolchain.

  ### Notes to the reviewers

  Let me know what you think @notmandatory

  fixes #1431

  ### Changelog notice

  ### Checklists

  #### TODO

  * [ ] Setup access token for [create-pull-request](https://github.com/marketplace/actions/create-pull-request)

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  oleonardolima:
    tACK b92f8c9

Tree-SHA512: e251fb8d0456c30a244f4611131baea1afc4f8323a3bdc8d9536d276a8b4bb2c0269beba6b04b72ab2ea96897e421a16c3e8e6065a755d62ff98bfe13d0b02bd

Author: notmandatory

.github/workflows/cont_integration.yml

@@ -4,6 +4,17 @@ name: CI
 
 jobs:
 
+  prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      rust_version: ${{ steps.read_toolchain.outputs.rust_version }}
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Read rust version"
+        id: read_toolchain
+        run: echo "rust_version=$(cat rust-version)" >> $GITHUB_OUTPUT
+  
   build-test:
     name: Build and test
     runs-on: ubuntu-latest
@@ -116,12 +127,13 @@ jobs:
         run: cargo fmt --all -- --config format_code_in_doc_comments=true --check
 
   clippy_check:
+    needs: prepare
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
       - uses: actions-rs/toolchain@v1
         with:
-            toolchain: 1.78.0
+            toolchain: ${{ needs.prepare.outputs.rust_version }}
             components: clippy
             override: true
       - name: Rust Cache

.github/workflows/cron-update-rust.yml

@@ -0,0 +1,42 @@
+name: Update rust version
+on:
+  schedule:
+    - cron: "0 0 15 * *" # At 00:00 on day-of-month 15.
+  workflow_dispatch: # allows manual triggering
+jobs:
+  format:
+    name: Update rustc
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Update rust-version to use latest stable
+        run: |
+          set -x
+          # Extract the version from whatever version of the compiler dtolnay/rust-toolchain gives us.
+          RUST_VERSION=$(rustc --verbose --version | sed -ne 's/^release: //p')
+          # Update the version in the reference file.
+          echo "${RUST_VERSION}" > rust-version
+          echo "rust_version=${RUST_VERSION}" >> $GITHUB_ENV
+          # In case of no new version don't make an empty PR.
+          if ! git diff --exit-code > /dev/null; then
+              echo "Updated rustc. Opening PR."
+              echo "changes_made=true" >> $GITHUB_ENV
+          else
+              echo "Attempted to update rustc but the latest stable date did not change. Not opening any PR."
+              echo "changes_made=false" >> $GITHUB_ENV
+          fi
+      - name: Create Pull Request
+        if: env.changes_made == 'true'
+        uses: peter-evans/create-pull-request@v6
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          author: Update Rustc Bot <[email protected]>
+          committer: Update Rustc Bot <[email protected]>
+          branch: create-pull-request/update-rust-version
+          title: |
+            ci: automated update to rustc ${{ env.rust_version }}
+          commit-message: |
+            ci: automated update to rustc ${{ env.rust_version }}
+          body: |
+            Automated update to Github CI workflow `cont_integration.yml` by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

rust-version

@@ -0,0 +1 @@
+1.79.0