Attempt to make CI go

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/stack-ci.yaml

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+name: Tests
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+    branches:
+      - support-ghc-9.2
+      - master
+
+jobs:
+  build:
+    name: stack / ghc ${{ matrix.ghc }} / ${{ matrix.platform }}
+    runs-on: ${{ matrix.platform }}
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ubuntu-latest]
+        resolver:
+          [
+            "lts-18.14",
+            "lts-16.31",
+            "lts-14.27",
+            "lts-12.26",
+            "lts-11.22"
+          ]
+        include:
+          - resolver: "lts-18.14"
+            ghc: "8.10.7"
+            ghv: "8.10"
+          - resolver: "lts-16.31"
+            ghc: "8.8.4"
+            ghv: "8.8"
+          - resolver: "lts-14.27"
+            ghc: "8.6.5"
+            ghv: "8.6"
+          - resolver: "lts-12.26"
+            ghc: "8.4.4"
+            ghv: "8.4"
+          - resolver: "lts-11.22"
+            ghc: "8.2.2"
+            ghv: "8.2"
+
+    steps:
+      - name: Setup GHC
+        uses: haskell/actions/setup@v1
+        with:
+          ghc-version: ${{ matrix.ghc }}
+          enable-stack: true
+
+      - name: Clone project
+        uses: actions/checkout@v2
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.stack
+          key: ${{ runner.os }}-${{ matrix.resolver }}-${{ hashFiles('stack.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.resolver }}-
+
+      # This entirely avoids the caching of a GHC version.
+      - name: Build and run tests
+        run: "stack test --fast --no-terminal --resolver=${{ matrix.resolver }} --system-ghc --stack-yaml=stack-${{ matrix.ghv }}.yaml"

stack-8.10.yaml

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+resolver: lts-18.14
+install-ghc: true
+system-ghc: false
+flags: {}
+packages:
+- '.'
+extra-deps:
+  # Using an outdated shelly, forces an outdated 'time', which breaks unix, directory, ...
+  # Instead, we don't build with 8.8 or 8.10 on Windows.
+  # - shelly-1.8.0 # 1.8.1 and 1.9.0 are broken for windows: see https://github.com/yesodweb/Shelly.hs/issues/176
+  # - time-1.8.0.4
+  - regex-pcre-0.95.0.0

stack-8.4.yaml

@@ -1,11 +1,11 @@
-resolver: lts-12.22
+resolver: lts-12.26
 install-ghc: true
 flags: {}
 packages:
 - '.'
 system-ghc: false
 extra-deps:
-  - shelly-1.8.0      # 1.8.1 is broken for windows: see https://github.com/yesodweb/Shelly.hs/issues/176
+  - shelly-1.8.0 # 1.8.1 and 1.9.0 are broken for windows: see https://github.com/yesodweb/Shelly.hs/issues/176
   - regex-tdfa-1.3.1.0
   - regex-base-0.94.0.0
   - regex-pcre-builtin-0.95.1.1.8.43

stack-8.6.yaml

@@ -1,11 +1,11 @@
-resolver: lts-14.21
+resolver: lts-14.27
 install-ghc: true
 system-ghc: false
 flags: {}
 packages:
 - '.'
 extra-deps:
-  - shelly-1.8.0      # 1.8.1 is broken for windows: see https://github.com/yesodweb/Shelly.hs/issues/176
+  - shelly-1.8.0 # 1.8.1 and 1.9.0 are broken for windows: see https://github.com/yesodweb/Shelly.hs/issues/176
   - regex-tdfa-1.3.1.0
   - regex-base-0.94.0.0
   - regex-pcre-builtin-0.95.1.1.8.43

stack-8.8.yaml

@@ -1,8 +1,12 @@
-resolver: nightly-2020-01-25
+resolver: lts-16.31
 install-ghc: true
 system-ghc: false
 flags: {}
 packages:
 - '.'
 extra-deps:
+  # Using an outdated shelly, forces an outdated 'time', which breaks unix, directory, ...
+  # Instead, we don't build with 8.8 or 8.10 on Windows.
+  # - shelly-1.8.0 # 1.8.1 and 1.9.0 are broken for windows: see https://github.com/yesodweb/Shelly.hs/issues/176
+  # - time-1.8.0.4
   - regex-pcre-0.95.0.0