Add quotes suggested by shellcheck

maintainer/pineappl-ci/script.sh

@@ -23,28 +23,28 @@ pdf_sets=(
 )
 
 apt update
-apt install -y ${pkgs[@]}
+apt install -y "${pkgs[@]}"
 
 # install rustup
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain none -y
 
 for version in ${RUST_V}; do
     # the last command will be the default
-    rustup install ${version} --profile minimal
-    rustup default ${version}
+    rustup install "${version}" --profile minimal
+    rustup default "${version}"
     # install LLVM tools needed for code coverage
     rustup component add llvm-tools
 done
 
 # install cargo-c needed for the CAPI
-cargo install --locked cargo-c --version ${CARGOC_V}
+cargo install --locked cargo-c --version "${CARGOC_V}"
 
 # remove files generated by cargo
 rm -r /usr/local/cargo/registry
 
 # install LHAPDF
 curl -L "https://lhapdf.hepforge.org/downloads/?f=LHAPDF-${LHAPDF_V}.tar.gz" | tar xzf -
-cd LHAPDF-${LHAPDF_V}
+cd "LHAPDF-${LHAPDF_V}"
 ./configure --disable-python
 make -j V=1
 make install
@@ -61,7 +61,7 @@ curl "https://data.nnpdf.science/pineappl/pdfs/240608-tr-pol-nlo-100.tar.gz" | t
 
 # install zlib; we need to link against it statically
 curl "https://www.zlib.net/zlib-${ZLIB_V}.tar.gz" | tar xzf -
-cd zlib-${ZLIB_V}
+cd "zlib-${ZLIB_V}"
 ./configure --prefix=/usr/local
 make -j
 make install
@@ -70,18 +70,18 @@ cd ..
 
 # install APPLgrid
 curl -L "https://applgrid.hepforge.org/downloads?f=applgrid-${APPLGRID_V}.tgz" | tar xzf -
-cd applgrid-${APPLGRID_V}
+cd "applgrid-${APPLGRID_V}"
 ./configure --without-root
 make -j
 make install
 ldconfig
-mkdir -p ${APPL_IGRID_DIR}
-cp src/*.h ${APPL_IGRID_DIR}
+mkdir -p "${APPL_IGRID_DIR}"
+cp src/*.h "${APPL_IGRID_DIR}"
 cd ..
 
 # install fastNLO
 curl "https://fastnlo.hepforge.org/code/v25/fastnlo_toolkit-${FASTNLO_V}.tar.gz" | tar xzf -
-cd fastnlo_toolkit-${FASTNLO_V}
+cd "fastnlo_toolkit-${FASTNLO_V}"
 ./configure --prefix=/usr/local/
 make -j V=1
 make install