.github/workflows: add some lightweight checks

Rebuild-required: false

.github/workflows/stage1.yml

@@ -45,23 +45,17 @@ jobs:
       - uses: jirutka/setup-alpine@v1
         with:
           branch: edge
-          packages: tar make wget zstd bash coreutils gcc build-base file
+          packages: tar make wget zstd bash coreutils gcc build-base
       - run: git clone https://repo.or.cz/tinycc.git tinycc
       - run: cd tinycc && git checkout af1abf1f45d45b34f0b02437f559f4dfdba7d23c
-      - run: cd tinycc && ./configure --config-musl --enable-static --extra-ldflags=-static && make
+      - run: cd tinycc && ./configure --config-musl --enable-static --extra-ldflags=-static && make -j $(nproc)
         shell: alpine.sh --root {0}
       - run: cp tinycc/tcc tcc-seed
         shell: alpine.sh --root {0}
-      - run: file tcc-seed || true
-        shell: alpine.sh --root {0}
-      - run: file tcc-seed || true
       - run: |
           sed -i 's|unshare -nr||' Makefile
           sed -i 's|unshare -nrm|unshare -rm|' helpers/chroot
         shell: alpine.sh --root {0}
-      - run: make pkgs/1-stage1.pkg || true
-        shell: alpine.sh --root {0}
-      - run: find tmp/build
       - run: make pkgs/1-stage1.pkg
         shell: alpine.sh --root {0}
       - name: trim verification list
@@ -71,5 +65,5 @@ jobs:
           grep 0-tcc-seed verify.pkgs.sha256
           grep 1-stage1 verify.pkgs.sha256
         shell: alpine.sh --root {0}
-      - run: make verify-pkgs-checksums
+      - run: make verify-pkgs-checksums  # warning: CUSTOM tcc is expected
         shell: alpine.sh --root {0}