;ci: github: linux: use smarter caching as in windows workflow

.github/workflows/linux-nightly.yml

@@ -84,50 +84,67 @@ jobs:
 
     steps:
 
-    # cached things
+    # declare/restore cached things
 
-    - name: Cache ~/.stack
+    - name: Cache stack global package db
+      id:   stack-global
       uses: actions/cache@v1
       with:
         path: ~/.stack
-        key: ${{ runner.os }}-stack
-        #key: ${{ runner.os }}-${{ matrix.resolver }}-stack
+        key:          ${{ runner.os }}-stack-global-${{ hashFiles('**.yaml') }}
+        restore-keys: ${{ runner.os }}-stack-global
 
-    - name: Cache ~/.local/bin
+    - name: show stuff
+      run: |
+        ls -lFRa ~/.stack
+
+    - name: Cache stack-installed programs in ~/.local/bin
+      id:   stack-programs
       uses: actions/cache@v1
       with:
         path: ~/.local/bin
-        key: ${{ runner.os }}-local-bin
+        key:          ${{ runner.os }}-stack-programs-${{ hashFiles('**.yaml') }}
+        restore-keys: ${{ runner.os }}-stack-programs
 
+    - name: show stuff
+      run: |
+        ls -lFRa ~/.local/bin
+
+    # stack's local package dbs for the project and each package
     - name: Cache .stack-work
       uses: actions/cache@v1
       with:
         path: .stack-work
-        key: ${{ runner.os }}-stack-work
+        key:          ${{ runner.os }}-stack-work-${{ hashFiles('**.yaml') }}
+        restore-keys: ${{ runner.os }}-stack-work
 
     - name: Cache hledger-lib/.stack-work
       uses: actions/cache@v1
       with:
         path: hledger-lib/.stack-work
-        key: ${{ runner.os }}-hledger-lib-stack-work
+        key:          ${{ runner.os }}-hledger-lib-stack-work-${{ hashFiles('hledger-lib/package.yaml') }}
+        restore-keys: ${{ runner.os }}-hledger-lib-stack-work
 
     - name: Cache hledger/.stack-work
       uses: actions/cache@v1
       with:
         path: hledger/.stack-work
-        key: ${{ runner.os }}-hledger-stack-work
+        key:          ${{ runner.os }}-hledger-stack-work-${{ hashFiles('hledger/package.yaml') }}
+        restore-keys: ${{ runner.os }}-hledger-stack-work
 
     - name: Cache hledger-ui/.stack-work
       uses: actions/cache@v1
       with:
         path: hledger-ui/.stack-work
-        key: ${{ runner.os }}-hledger-ui-stack-work
+        key:          ${{ runner.os }}-hledger-ui-stack-work-${{ hashFiles('hledger-ui/package.yaml') }}
+        restore-keys: ${{ runner.os }}-hledger-ui-stack-work
 
     - name: Cache hledger-web/.stack-work
       uses: actions/cache@v1
       with:
         path: hledger-web/.stack-work
-        key: ${{ runner.os }}-hledger-web-stack-work
+        key:          ${{ runner.os }}-hledger-web-stack-work-${{ hashFiles('hledger-web/package.yaml') }}
+        restore-keys: ${{ runner.os }}-hledger-web-stack-work
 
     # actions