build: add cache to ./configure with -C flag

Add the -C flag to ./configure to enable caching, reducing redundant
resource fetching during builds when packages and the machine remain
unchanged. Caching may cause issues only if applied across different machines
or if packages are modified, neither of which is the case during the build.

Dockerfile.debian

@@ -5,6 +5,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   autoconf \
   autoconf-archive \
   automake \
+  ca-certificates \
   expect \
   gcc \
   git \
@@ -36,7 +37,7 @@ RUN mkdir -p /usr/src/{stabber,libstrophe,profanity}
 WORKDIR /usr/src
 
 #RUN git clone https://github.com/boothj5/stabber
-RUN git clone -c http.sslverify=false https://github.com/strophe/libstrophe
+RUN git clone --depth 1 https://git.jabber.space/devs/libstrophe-gh.git libstrophe
 
 #WORKDIR /usr/src/stabber
 #RUN ./bootstrap.sh
@@ -47,7 +48,7 @@ RUN git clone -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
 
 WORKDIR /usr/src/profanity

Dockerfile.fedora

@@ -9,6 +9,7 @@ RUN dnf install -y \
   autoconf-archive \
   automake \
   awk \
+  ca-certificates \
   expect-devel \
   gcc \
   git \
@@ -56,11 +57,11 @@ WORKDIR /usr/src
 
 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 https://git.jabber.space/devs/libstrophe-gh.git 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.ubuntu

@@ -6,6 +6,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   autoconf \
   autoconf-archive \
   automake \
+  ca-certificates \
   expect \
   gcc \
   git \
@@ -37,7 +38,7 @@ RUN mkdir -p /usr/src/{stabber,libstrophe,profanity}
 WORKDIR /usr/src
 
 #RUN git clone https://github.com/boothj5/stabber
-RUN git clone -c http.sslverify=false https://github.com/strophe/libstrophe
+RUN git clone --depth 1 https://git.jabber.space/devs/libstrophe-gh.git libstrophe
 
 # TODO: Re-enable once libmicrohttpd-dev has been updated.
 #WORKDIR /usr/src/stabber
@@ -49,7 +50,7 @@ RUN git clone -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
 
 WORKDIR /usr/src/profanity

ci-build.sh

@@ -121,11 +121,11 @@ 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
@@ -140,11 +140,11 @@ esac
 for features in "${tests[@]}"
 do
     echo
-    echo "--> Building with ./configure ${features} $*"
+    echo "--> Building with ./configure -C ${features} $*"
     echo
 
     # shellcheck disable=SC2086
-    ./configure $features $*
+    ./configure -C $features $*
 
     $MAKE CC="${CC}"
     $MAKE check