Fix CI: Gitea Actions cache keys never actually changed

Confirmed via Gitea's own documentation (about.gitea.com's actions-cache
tutorial): Gitea Actions doesn't support the built-in hashFiles()
expression function GitHub Actions provides - it silently evaluates to
an empty string rather than erroring, so all three cache keys
(emsdk-${{hashFiles(...)}}, etc.) were actually just the constant
strings "emsdk-", "deps-wasm32-", "libwinevbs-wasm32-" on every run,
regardless of whether scripts/versions.sh or patches/ actually changed -
this is why caching "didn't work properly": correctness-wise it's worse
than no caching, since a stale cache from before a version/patch bump
would keep being reused indefinitely instead of invalidating.

Replaced with a plain sha256sum-based step that hashes the same inputs
by hand and exposes them via GITHUB_OUTPUT - no dependency on Gitea
gaining hashFiles() support, and verified locally to produce distinct,
non-empty hashes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -16,23 +16,36 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y bison cmake curl python3
 
+      # Gitea Actions doesn't support the built-in hashFiles() expression
+      # function (unlike GitHub Actions) - it silently evaluates to an empty
+      # string, which turned every cache key below into the same constant
+      # string regardless of what actually changed, so a cache entry from
+      # before a dependency-version or patch change would still be reused
+      # forever. Hash the same inputs by hand instead.
+      - name: Compute cache keys
+        id: cache-keys
+        run: |
+          echo "emsdk=$(sha256sum scripts/versions.sh | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+          echo "deps-wasm32=$(cat scripts/versions.sh $(find patches -type f | sort) | sha256sum | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+          echo "libwinevbs=$(cat scripts/versions.sh $(find patches/libwinevbs -type f | sort) | sha256sum | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+
       - name: Cache emsdk
         uses: https://github.com/actions/cache@v4
         with:
           path: emsdk
-          key: emsdk-${{ hashFiles('scripts/versions.sh') }}
+          key: emsdk-${{ steps.cache-keys.outputs.emsdk }}
 
       - name: Cache wasm32 dependency builds
         uses: https://github.com/actions/cache@v4
         with:
           path: build/deps-wasm32
-          key: deps-wasm32-${{ hashFiles('scripts/versions.sh', 'patches/**') }}
+          key: deps-wasm32-${{ steps.cache-keys.outputs.deps-wasm32 }}
 
       - name: Cache libwinevbs build
         uses: https://github.com/actions/cache@v4
         with:
           path: vendor/libwinevbs/build
-          key: libwinevbs-wasm32-${{ hashFiles('scripts/versions.sh', 'patches/libwinevbs/**') }}
+          key: libwinevbs-wasm32-${{ steps.cache-keys.outputs.libwinevbs }}
 
       - name: Setup (fetch + patch vendor sources)
         run: ./scripts/setup.sh
@@ -77,23 +90,36 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y bison cmake curl python3
 
+      # Gitea Actions doesn't support the built-in hashFiles() expression
+      # function (unlike GitHub Actions) - it silently evaluates to an empty
+      # string, which turned every cache key below into the same constant
+      # string regardless of what actually changed, so a cache entry from
+      # before a dependency-version or patch change would still be reused
+      # forever. Hash the same inputs by hand instead.
+      - name: Compute cache keys
+        id: cache-keys
+        run: |
+          echo "emsdk=$(sha256sum scripts/versions.sh | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+          echo "deps-wasm32=$(cat scripts/versions.sh $(find patches -type f | sort) | sha256sum | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+          echo "libwinevbs=$(cat scripts/versions.sh $(find patches/libwinevbs -type f | sort) | sha256sum | cut -d' ' -f1)" >> "$GITHUB_OUTPUT"
+
       - name: Cache emsdk
         uses: https://github.com/actions/cache@v4
         with:
           path: emsdk
-          key: emsdk-${{ hashFiles('scripts/versions.sh') }}
+          key: emsdk-${{ steps.cache-keys.outputs.emsdk }}
 
       - name: Cache wasm32 dependency builds
         uses: https://github.com/actions/cache@v4
         with:
           path: build/deps-wasm32
-          key: deps-wasm32-${{ hashFiles('scripts/versions.sh', 'patches/**') }}
+          key: deps-wasm32-${{ steps.cache-keys.outputs.deps-wasm32 }}
 
       - name: Cache libwinevbs build
         uses: https://github.com/actions/cache@v4
         with:
           path: vendor/libwinevbs/build
-          key: libwinevbs-wasm32-${{ hashFiles('scripts/versions.sh', 'patches/libwinevbs/**') }}
+          key: libwinevbs-wasm32-${{ steps.cache-keys.outputs.libwinevbs }}
 
       - name: Setup (fetch + patch vendor sources)
         run: ./scripts/setup.sh