add codeberg ci and cleanup github one (#311)

- apt-get is slow, takes up ~1m40s just to install deps, fix it by not
  using it. instead use alpine linux for codeberg ci, which brings build
  time down to 25s.
- And since alpine uses musl, it's probably a good idea to use it on our
  ci since it might catch us using any glibc extensions. The github ci
  can keep using ubuntu.
- remove duplication of CFLAGS by having it on a separate file instead.
- remove pull_request from github ci since we no longer accept PRs
  there.

Closes: https://codeberg.org/nsxiv/nsxiv/issues/307

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/311
Reviewed-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>
Reviewed-by: TAAPArthur <taaparthur@noreply.codeberg.org>

.woodpecker/CFLAGS

@@ -0,0 +1,13 @@
+# vanilla flags
+-std=c99 -Wall -pedantic
+# optimizations: enables extra warnings and deeper analysis thus catches more errors/warnings
+-O3 -flto
+# treat warnings as errors
+-Werror
+# extra flags
+-Wextra -Wshadow -Wvla -Wpointer-arith
+-Wundef -Wstrict-overflow=4 -Wwrite-strings -Wunreachable-code
+-Wbad-function-cast -Wdeclaration-after-statement
+-Wmissing-prototypes -Wstrict-prototypes
+# silence
+-Wno-sign-compare -Wno-unused-parameter -Wno-missing-field-initializers

.woodpecker/build.yml

@@ -0,0 +1,28 @@
+# NOTE: "stable" tcc is too old and fails at linking. instead fetching a recent known working commit.
+pipeline:
+  build:
+    image: alpine
+    environment:
+      - TCC_SHA=027b8fb9b88fe137447fb8bb1b61079be9702472
+    when:
+      branch: master
+    commands: |
+      apk add --no-cache \
+          imlib2 imlib2-dev xorgproto \
+          libxft libxft-dev libexif libexif-dev giflib giflib-dev libwebp libwebp-dev \
+          gcc clang llvm12 llvm12-dev build-base wget ca-certificates >/dev/null
+      wget "https://github.com/TinyCC/tinycc/archive/$TCC_SHA.tar.gz" >/dev/null
+      tar xzf "$TCC_SHA.tar.gz" >/dev/null
+      ( cd "tinycc-$TCC_SHA" && ./configure --config-musl && make -s -j"$(nproc)" && make install; ) >/dev/null
+      CFLAGS="$(sed '/^#/d' .woodpecker/CFLAGS | paste -d ' ' -s)"
+      build () {
+        for cc in "gcc" "clang" "tcc"; do
+          echo "### $cc - $2 build ###"
+          make clean && make -s -j"$(nproc)" CC="$cc" CFLAGS="$CFLAGS" LDFLAGS="$CFLAGS" OPT_DEP_DEFAULT="$1"
+        done
+      }
+      # full-build #
+      build "1" "full"
+      # ensure minimal-build works without opt deps installed
+      apk del libxft libxft-dev libexif libexif-dev giflib giflib-dev libwebp libwebp-dev >/dev/null
+      build "0" "minimal"