add linear builds; use GHA ENV to set CABAL_DIR

Author: ulysses4ever

.github/workflows/build-liquid.yaml

@@ -16,6 +16,9 @@ on:
       - "**/README.md"
   workflow_dispatch:
 
+env:
+  CABAL_DIR: '/cabal-dir'  # due to container; see top-level Dockerfile
+
 jobs:
   main:
     runs-on: ubuntu-latest
@@ -37,5 +40,4 @@ jobs:
 
       - name: Build in liquid mode
         run: |
-          export CABAL_DIR=/cabal-dir # due to running in a container
           cabal build lh-array-sort

.github/workflows/build-test-linear.yaml

@@ -16,9 +16,13 @@ on:
       - "**/README.md"
   workflow_dispatch:
 
+env:
+  CABAL_DIR: '/cabal-dir'
+
 jobs:
   test-mutable-arrays:
     runs-on: ubuntu-latest
+    container: ghcr.io/ulysses4ever/lh-array-sort
     steps:
 
       - uses: actions/checkout@v4
@@ -54,6 +58,7 @@ jobs:
 
   test-prim-mutable-arrays:
     runs-on: ubuntu-latest
+    container: ghcr.io/ulysses4ever/lh-array-sort
     steps:
 
       - uses: actions/checkout@v4
@@ -86,6 +91,7 @@ jobs:
 
   test-pure-arrays:
     runs-on: ubuntu-latest
+    container: ghcr.io/ulysses4ever/lh-array-sort
     steps:
 
       - uses: actions/checkout@v4
@@ -119,6 +125,7 @@ jobs:
 
   run-benchrunner:
     runs-on: ubuntu-latest
+    container: ghcr.io/ulysses4ever/lh-array-sort
     steps:
 
       - uses: actions/checkout@v4