Workflow retry hack

I got random "Invalid memory access" when running `crystal build`.
This is probably a compiler or LLVM bug.
We use this temporary hack to retry until they fix it.

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Install dependencies
       run: apk add --no-cache yarn yaml sqlite-static libarchive-dev libarchive-static acl-static expat-static zstd-static lz4-static bzip2-static
     - name: Build
-      run: make static
+      run: make static || make static
     - name: Linter
       run: make check
     - name: Run tests
@@ -30,9 +30,9 @@ jobs:
         name: mango
         path: mango
     - name: build arm32v7 object file
-      run: make arm32v7
+      run: make arm32v7 || make arm32v7
     - name: build arm64v8 object file
-      run: make arm64v8
+      run: make arm64v8 || make arm64v8
     - name: Upload object files
       uses: actions/upload-artifact@v2
       with:

Makefile

@@ -12,10 +12,10 @@ setup: libs
 	yarn gulp dev
 
 build: libs
-	crystal build src/mango.cr --release --progress
+	crystal build src/mango.cr --release --progress --error-trace
 
 static: uglify | libs
-	crystal build src/mango.cr --release --progress --static
+	crystal build src/mango.cr --release --progress --static --error-trace
 
 libs:
 	shards install --production
@@ -32,10 +32,10 @@ check:
 	./dev/linewidth.sh
 
 arm32v7:
-	crystal build src/mango.cr --release --progress --cross-compile --target='arm-linux-gnueabihf' -o mango-arm32v7
+	crystal build src/mango.cr --release --progress --error-trace --cross-compile --target='arm-linux-gnueabihf' -o mango-arm32v7
 
 arm64v8:
-	crystal build src/mango.cr --release --progress --cross-compile --target='aarch64-linux-gnu' -o mango-arm64v8
+	crystal build src/mango.cr --release --progress --error-trace --cross-compile --target='aarch64-linux-gnu' -o mango-arm64v8
 
 install:
 	cp mango $(INSTALL_DIR)/mango