Readd missing cargo build for armv7. Thanks to @dani-garcia!

docker/Dockerfile.j2

@@ -228,6 +228,8 @@ RUN cargo build --features ${DB} --release
 RUN cargo build --features ${DB} --release --target=aarch64-unknown-linux-gnu
 {% elif "armv6" in target_file %}
 RUN cargo build --features ${DB} --release --target=arm-unknown-linux-gnueabi
+{% elif "armv7" in target_file %}
+RUN cargo build --features ${DB} --release --target=armv7-unknown-linux-gnueabihf
 {% endif %}
 
 ######################## RUNTIME IMAGE  ########################

docker/armv7/mysql/Dockerfile

@@ -96,6 +96,7 @@ RUN touch src/main.rs
 
 # Builds again, this time it'll just be
 # your actual source files being built
+RUN cargo build --features ${DB} --release --target=armv7-unknown-linux-gnueabihf
 
 ######################## RUNTIME IMAGE  ########################
 # Create a new stage with a minimal image

docker/armv7/sqlite/Dockerfile

@@ -90,6 +90,7 @@ RUN touch src/main.rs
 
 # Builds again, this time it'll just be
 # your actual source files being built
+RUN cargo build --features ${DB} --release --target=armv7-unknown-linux-gnueabihf
 
 ######################## RUNTIME IMAGE  ########################
 # Create a new stage with a minimal image