CI: Use script from rust-bitcoin-maintainer-tools

We have a CI script in the `rust-bitcoin-maintainer-tools` repository,
lets use it.

.github/workflows/rust.yml

@@ -1,37 +1,98 @@
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+      - 'test-ci/**'
+  pull_request:
 
 name: Continuous integration
 
 jobs:
-  tests:
-    name: Tests
+  Stable:                       # 2 jobs, one per lock file.
+    name: Test - stable toolchain
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
+      matrix:
+        dep: [minimal, recent]
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: actions/checkout@v4
+        with:
+          repository: tcharding/rust-bitcoin-maintainer-tools
+          ref: 05-02-ci
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@stable
+      - name: "Copy lock file"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh stable
+
+  Nightly:                      #  2 jobs, one per lock file.
+    name: Test - nightly toolchain
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
       matrix:
-        include:
-          - rust: stable
-            env:
-              RUSTFMTCHK: true
-          - rust: nightly
-            env:
-              RUSTFMTCHK: false
-          - rust: 1.56.1
-            env:
-              RUSTFMTCHK: false
+        dep: [minimal, recent]
     steps:
-      - name: Checkout Crate
-        uses: actions/checkout@v2
-      - name: Checkout Toolchain
-        uses: actions-rs/toolchain@v1
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: actions/checkout@v4
         with:
-          profile: minimal
-          toolchain: ${{ matrix.rust }}
-          override: true
-      - name: Running test script
-        env: ${{ matrix.env }}
-        run: ./contrib/test.sh
+          repository: tcharding/rust-bitcoin-maintainer-tools
+          ref: 05-02-ci
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@nightly
+      - name: "Copy lock file"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh nightly
+
+  MSRV:                         # 2 jobs, one per lock file.
+    name: Test - 1.56.1 toolchain
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        dep: [minimal, recent]
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Checkout maintainer tools"
+        uses: actions/checkout@v4
+        with:
+          repository: tcharding/rust-bitcoin-maintainer-tools
+          ref: 05-02-ci
+          path: maintainer-tools
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: "1.56.1"
+      - name: "Copy lock file"
+        run: cp Cargo-${{ matrix.dep }}.lock Cargo.lock
+      - name: "Run test script"
+        run: ./maintainer-tools/ci/run_task.sh msrv
+
+  Format:                       #  1 jobs, run cargo fmt directly.
+    name: Format - stable toolchain
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: "Checkout repo"
+        uses: actions/checkout@v4
+      - name: "Select toolchain"
+        uses: dtolnay/rust-toolchain@stable
+      - name: "Check formatting"
+        run: cargo fmt --all -- --check
 
-  Integration:
+  Integration:                  # 1 job for each Bitcoin Core version.
     name: Integration tests - stable toolchain
     runs-on: ubuntu-latest
     strategy:

client/contrib/test_vars.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Test all these features with "std" enabled.
+FEATURES_WITH_STD=""
+
+# Test all these features without "std" enabled.
+FEATURES_WITHOUT_STD="verifymessage"
+
+# Run these examples.
+EXAMPLES="retry_client:verifymessage"

contrib/crates.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+# Crates in this workspace to test (excl. fuzz an integration-tests).
+CRATES=("json" "client")

contrib/pin.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+#
+# Do pinning as required for current MSRV.
+
+set -euo pipefail
+
+cargo update -p tempfile --precise 3.6.0
+cargo update -p cc --precise 1.0.79
+cargo update -p log --precise 0.4.18
+cargo update -p serde_json --precise 1.0.96
+cargo update -p serde --precise 1.0.156
+

json/Cargo.toml

@@ -27,3 +27,4 @@ serde = { version = "1", features = [ "derive" ] }
 serde_json = "1"
 
 bitcoin = { version = "0.31.0", features = ["serde", "rand-std"]}
+

json/contrib/test_vars.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Test all these features with "std" enabled.
+FEATURES_WITH_STD=""
+
+# Test all these features without "std" enabled.
+FEATURES_WITHOUT_STD=""
+
+# Run these examples.
+EXAMPLES=""