perf: optimize build with configure cache and parallel make

- Add -C flag to ./configure for caching results
- Use --depth 1 for git clone (faster)
- Use make -j$(nproc) for stabber/libstrophe builds

Borrowed optimizations from build/multicore branch.

Dockerfile.arch

@@ -63,12 +63,12 @@ USER root
 RUN pacman -U --noconfirm libstrophe-git/libstrophe-git-*.pkg.tar.zst
 
 WORKDIR /usr/src
-RUN git clone -c http.sslverify=false https://git.jabber.space/devs/stabber
+RUN git clone --depth 1 -c http.sslverify=false https://git.jabber.space/devs/stabber
 
 WORKDIR /usr/src/stabber
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr --disable-dependency-tracking
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 WORKDIR /usr/src/profanity

Dockerfile.debian

@@ -39,19 +39,19 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 RUN mkdir -p /usr/src/{stabber,libstrophe,profanity}
 WORKDIR /usr/src
 
-RUN git clone -c http.sslverify=false https://git.jabber.space/devs/stabber
-RUN git clone -c http.sslverify=false https://github.com/strophe/libstrophe
+RUN git clone --depth 1 -c http.sslverify=false https://git.jabber.space/devs/stabber
+RUN git clone --depth 1 -c http.sslverify=false https://github.com/strophe/libstrophe
 
 WORKDIR /usr/src/stabber
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr --disable-dependency-tracking
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 WORKDIR /usr/src/libstrophe
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 WORKDIR /usr/src/profanity

Dockerfile.fedora

@@ -49,20 +49,20 @@ ENV TERM=xterm
 RUN mkdir -p /usr/src
 WORKDIR /usr/src
 
-RUN git clone -c http.sslverify=false https://git.jabber.space/devs/stabber
+RUN git clone --depth 1 -c http.sslverify=false https://git.jabber.space/devs/stabber
 WORKDIR /usr/src/stabber
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr --disable-dependency-tracking
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 WORKDIR /usr/src
 RUN mkdir -p /usr/src/libstrophe
-RUN git clone -c http.sslverify=false https://github.com/strophe/libstrophe
+RUN git clone --depth 1 -c http.sslverify=false https://github.com/strophe/libstrophe
 WORKDIR /usr/src/libstrophe
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 RUN mkdir -p /usr/src/profanity

Dockerfile.tumbleweed

@@ -48,11 +48,11 @@ ENV TERM=xterm
 RUN mkdir -p /usr/src
 WORKDIR /usr/src
 
-RUN git clone -c http.sslverify=false https://git.jabber.space/devs/stabber
+RUN git clone --depth 1 -c http.sslverify=false https://git.jabber.space/devs/stabber
 WORKDIR /usr/src/stabber
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr --disable-dependency-tracking
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 RUN mkdir -p /usr/src/profanity

Dockerfile.ubuntu

@@ -38,19 +38,19 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 RUN mkdir -p /usr/src/{stabber,libstrophe,profanity}
 WORKDIR /usr/src
 
-RUN git clone -c http.sslverify=false https://git.jabber.space/devs/stabber
-RUN git clone -c http.sslverify=false https://github.com/strophe/libstrophe
+RUN git clone --depth 1 -c http.sslverify=false https://git.jabber.space/devs/stabber
+RUN git clone --depth 1 -c http.sslverify=false https://github.com/strophe/libstrophe
 
 WORKDIR /usr/src/stabber
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr --disable-dependency-tracking
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 WORKDIR /usr/src/libstrophe
 RUN ./bootstrap.sh
 RUN ./configure --prefix=/usr
-RUN make
+RUN make -j$(nproc)
 RUN make install
 
 WORKDIR /usr/src/profanity

ci-build.sh

@@ -107,11 +107,11 @@ esac
 case "$ARCH" in
     linux*)
          echo
-         echo "--> Building with ./configure ${tests[0]} --enable-valgrind $*"
+         echo "--> Building with ./configure -C ${tests[0]} --enable-valgrind $*"
          echo
 
          # shellcheck disable=SC2086
-        ./configure ${tests[0]} --enable-valgrind $*
+        ./configure -C ${tests[0]} --enable-valgrind $*
 
         $MAKE CC="${CC}"
         if grep '^ID=' /etc/os-release | grep -q -e debian; then
@@ -133,13 +133,13 @@ build_and_test() {
 
     {
         echo "=== Build $idx started at $(date) ==="
-        echo "--> Building in $build_dir with ./configure $features $extra_args"
+        echo "--> Building in $build_dir with ./configure -C $features $extra_args"
 
         mkdir -p "$build_dir"
         cd "$build_dir"
 
         # shellcheck disable=SC2086
-        ../configure $features $extra_args
+        ../configure -C $features $extra_args
 
         $MAKE CC="${CC}"
         $MAKE check-functional-parallel