fix: cache T4/T5 compiled WASM artifacts to avoid 25min componentize

jco componentize compiles SpiderMonkey which takes 25+ minutes on CI.
Cache the built handler.wasm keyed on handler source + WIT definitions.
Test scripts skip the build step when the cached artifact exists.

Author: nadilas

.github/workflows/integration-tests.yml

@@ -231,6 +231,17 @@ jobs:
       - name: Install T4 dependencies
         run: npm ci --prefix test-apps/t4-ts-http-postgres
 
+      - name: Cache T4 standalone WASM
+        id: t4-wasm-cache
+        uses: actions/cache@v4
+        with:
+          path: test-apps/t4-ts-http-postgres/dist/handler.wasm
+          key: t4-wasm-${{ hashFiles('test-apps/t4-ts-http-postgres/src/handler-standalone.js', 'test-apps/t4-ts-http-postgres/wit-standalone/**') }}
+
+      - name: Build T4 standalone WASM
+        if: steps.t4-wasm-cache.outputs.cache-hit != 'true'
+        run: test-apps/t4-ts-http-postgres/build.sh --standalone
+
       - name: Build & Test T4
         run: test-apps/t4-ts-http-postgres/test.sh
 
@@ -285,6 +296,17 @@ jobs:
       - name: Install T5 dependencies
         run: bun install --frozen-lockfile --cwd test-apps/t5-bun-http-postgres
 
+      - name: Cache T5 standalone WASM
+        id: t5-wasm-cache
+        uses: actions/cache@v4
+        with:
+          path: test-apps/t5-bun-http-postgres/dist/handler.wasm
+          key: t5-wasm-${{ hashFiles('test-apps/t5-bun-http-postgres/src/handler-standalone.js', 'test-apps/t5-bun-http-postgres/wit-standalone/**') }}
+
+      - name: Build T5 standalone WASM
+        if: steps.t5-wasm-cache.outputs.cache-hit != 'true'
+        run: test-apps/t5-bun-http-postgres/build.sh --standalone
+
       - name: Build & Test T5
         run: test-apps/t5-bun-http-postgres/test.sh
 

test-apps/t4-ts-http-postgres/test.sh

@@ -86,7 +86,11 @@ if [ ! -x "${JCO_BIN}" ]; then
 fi
 
 # Build the standalone handler (no warpgrid shim deps)
-if "${SCRIPT_DIR}/build.sh" --standalone 2>&1; then
+# Skip build if handler.wasm already exists (e.g. from CI cache)
+if [ -f "${SCRIPT_DIR}/dist/handler.wasm" ]; then
+    WASM_SIZE="$(wc -c < "${SCRIPT_DIR}/dist/handler.wasm" | tr -d ' ')"
+    pass "Standalone handler already built (${WASM_SIZE} bytes, cached)"
+elif "${SCRIPT_DIR}/build.sh" --standalone 2>&1; then
     if [ -f "${SCRIPT_DIR}/dist/handler.wasm" ]; then
         WASM_SIZE="$(wc -c < "${SCRIPT_DIR}/dist/handler.wasm" | tr -d ' ')"
         pass "Standalone handler compiled (${WASM_SIZE} bytes)"

test-apps/t5-bun-http-postgres/test.sh

@@ -87,7 +87,11 @@ if [ ! -x "${JCO_BIN}" ]; then
 fi
 
 # Build the standalone handler (no warpgrid shim deps)
-if "${SCRIPT_DIR}/build.sh" --standalone 2>&1; then
+# Skip build if handler.wasm already exists (e.g. from CI cache)
+if [ -f "${SCRIPT_DIR}/dist/handler.wasm" ]; then
+    WASM_SIZE="$(wc -c < "${SCRIPT_DIR}/dist/handler.wasm" | tr -d ' ')"
+    pass "Standalone handler already built (${WASM_SIZE} bytes, cached)"
+elif "${SCRIPT_DIR}/build.sh" --standalone 2>&1; then
     if [ -f "${SCRIPT_DIR}/dist/handler.wasm" ]; then
         WASM_SIZE="$(wc -c < "${SCRIPT_DIR}/dist/handler.wasm" | tr -d ' ')"
         pass "Standalone handler compiled (${WASM_SIZE} bytes)"