GitHub action to check Rust stable version against Rust installed in latest docker container

.github/workflows/check.yml

@@ -0,0 +1,23 @@
+name: Check
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 4 * * 3'
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        name: Check Rust Version
+      - run: make check
+  create_issue:
+    runs-on: ubuntu-latest
+    needs: check
+    if: always() && (needs.check.result == 'failure')
+    steps:
+      - run: gh issue create --title "Time to update to Rust" --body "Build update for next version of Rust" --label "enhancement" -R $GITHUB_REPOSITORY
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+

.gitignore

@@ -1,3 +1,4 @@
 tests/test-*/test-out.log
 target
 .DS_Store
+.vscode

Dockerfile

@@ -6,6 +6,7 @@ RUN yum install -y jq openssl-devel
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
     | CARGO_HOME=/cargo RUSTUP_HOME=/rustup sh -s -- -y --profile minimal --default-toolchain $RUST_VERSION
 ADD build.sh /usr/local/bin/
+ADD latest.sh /usr/local/bin/
 VOLUME ["/code"]
 WORKDIR /code
 ENTRYPOINT ["/usr/local/bin/build.sh"]

Makefile

@@ -25,3 +25,8 @@ debug: build
 		-v ${HOME}/.cargo/git:/cargo/git  \
 		--entrypoint=/bin/bash \
 		$(REPO):$(TAG)
+
+check: 
+	$(DOCKER) run --rm \
+		--entrypoint=/usr/local/bin/latest.sh \
+		$(REPO)

latest.sh

@@ -0,0 +1,15 @@
+#!/bin/bash -eux
+
+export CARGO_HOME="/cargo"
+export RUSTUP_HOME="/rustup"
+
+# shellcheck disable=SC1091
+source /cargo/env
+
+rustup toolchain install stable --profile=minimal
+STABLE=$(rustup check | grep stable | grep -E "[0-9]+\.[0-9]+\.[0-9]+" -o)
+DEFAULT=$(rustup show | grep -m 1 default | grep -E "[0-9]+\.[0-9]+\.[0-9]+" -o)
+
+if [ "${STABLE}" == "${DEFAULT}" ]; then exit 0
+    else exit 1
+fi